US008178671B2

(12) United States Patent (10) Patent No.: US 8,178,671 B2 Singh et al. (45) Date of Patent: *May 15, 2012

(54) METHODS OF TREATING OR PREVENTING 4,166,452 A 9/1979 Generales, Jr. 4,256,108 A 3, 1981 Theeuwes AUTOIMMUNE DISEASES WITH 2, 4,265,874 A 5/1981 Bonsen et al. 4-PYRIMDINEDLAMINE COMPOUNDS 4,713,388 A 12/1987 Ezer et al. 4.866,048 A 9/1989 Calverley et al. (75) Inventors: Rajinder Singh, Belmont, CA (US); 4,968,781 A 11/1990 Seitz et al. 4,983,608 A 1/1991 Effland et al. Ankush Argade, Foster City, CA (US); 5,147,876 A 9, 1992 Mizuchi et al. Hui Li, Millbrae, CA (US); Somasekhar 5,179.204 A 1/1993 Effland et al. Bhamidipati, Foster City, CA (US); 5,194,431 A 3, 1993 Deluca et al. David Carroll, San Francisco, CA (US); 5,200,400 A 4/1993 Teramoto et al. 5,206,229 A 4/1993 Calverley et al. Catherine Sylvain, San Mateo, CA 5,223,505 A 6/1993 Hargreaves et al. (US); Jeffrey Clough, Redwood City, 5,246,948 A 9, 1993 Takatani et al. CA (US); Holger Keim, Menlo Park, 5,292,728 A 3, 1994 Neef et al. 5,420,129 A 5/1995 Breu et al. CA (US) 5,446,035 A 8, 1995 Neef et al. 5,521, 184 A 5/1996 Zimmerman 73) AssigSSignee: Rigel PhPharmaceuticals, icals. Inc..Inc., South SanS 5,532,228 A 7/1996 Neef et al. Francisco, CA (US) 5,585,381 A 12/1996 Yanaka et al. 5,700,904 A 12/1997 Baker et al. *) NotOt1Ce: Subjubject to anyy d1Sclaimer,disclai theh term off thithis 5,728,536 A 3, 1998 Ihleet al. 5,840,893 A 1 1/1998 Bukrinsky et al. patent is extended or adjusted under 35 5,859,032 A 1/1999 Nishino et al. U.S.C. 154(b) by 1747 days. 5,863,924 A 1/1999 Berger et al. 5,958,935 A 9, 1999 Davis et al. This patent is Subject to a terminal dis 5,985,856 A 11/1999 Stella et al. claimer. 6,004,985 A 12/1999 Kochanny et al. 6,022,884 A 2/2000 Mantlo et al. (21) Appl. No.: 10/903,263 6,048,866 A 4/2000 Hutchings et al. 6,069,141 A 5/2000 Barbachyn et al. (22) Filed: Jul. 30, 2004 6,080,747 A 6/2000 Uckun et al. 6,080,748 A 6/2000 Uckun et al. (65) Prior Publication Data 6,080,858 A 6/2000 Schumacher (Continued) US 2005/O234049 A1 Oct. 20, 2005 FOREIGN PATENT DOCUMENTS Related U.S. Application Data AU T48O87 B2 8, 1999 (60) Provisional application No. 60/491,641, filed on Jul. (Continued) 30, 2003, provisional application No. 60/531,598, filed on Dec. 19, 2003, provisional application No. OTHER PUBLICATIONS 60/572.246, filed on May 18, 2004. West, Anthony R., Solid State Chemistry and its Applications, Wiley, New York, 1988, pp. 358 & 365.* Vippagunta et al., Advanced Drug (51) Int. Cl. Delivery Reviews 48: 3-26, 2001.* CO7D 239/48 (2006.01) Cha et al., Journal of Pharmacology and Experimental Therapeutics, CO7D 403/2 (2006.01) 317(2), 571-578, 2006.* CO7D 403/4 (2006.01) Braselmann et al., Journal of Pharmacology and Experimental Thera CO7D 413/2 (2006.01) peutics, 319(3), 998-1008, 2006.* Cores: An Automated Method for Generating Three-Dimensional C07D 417/12 (2006.01) Models of Protein/Ligand Complexes, Hare, Brian J. Journal of A6 IK3I/506 (2006.01) Chemistry (2004)47(19), 4731-4740. A6 IK3I/498 (2006.01) A 6LX3/5.375 (2006.01) (Continued) A6 IK3I/5383 (2006.01) A6 IK3I/545 (2006.01) Primary Examiner — Venkataraman Balasubramanian A6IP 9/02 (2006.01) (74) Attorney, Agent, or Firm — Travis Young; McDonnell (52) U.S. Cl...... 544/320:544/323:544/324; 544/51: Boehnen Hulbert & Berghoff LLP 544/52:544/60:544/105:544/114: 514/272: 514/275; 514/227.5: 514/228.5: 514/230.5; (57) ABSTRACT 514/230.8; 514/231.5 The present invention provides methods of treating or pre (58) Field of Classification Search ...... 544/320, venting autoimmune diseases with 2.4-pyrimidinediamine 544/323,324, 51, 52, 60, 105, 114: 514/272, compounds, as well as methods of treating, preventing or 514/275,227.5, 228.5, 230.5, 230.8, 231.5 ameliorating symptoms associated with Such diseases. Spe See application file for complete search history. cific examples of autoimmune diseases that can be treated or prevented with the compounds include rheumatoid arthritis (56) References Cited and/or its associated symptoms, systemic lups erythematosis and/or its associated symptoms and multiple Sclerosis and/or U.S. PATENT DOCUMENTS its associated symptoms. 3,159,547 A 12/1964 Hollis et al. 3,320,256 A 5/1967 Duschinsky et al. 10 Claims, 3 Drawing Sheets US 8,178,671 B2 Page 2

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Tret'Yakova et al. 1980, Phys. Active Substances 12:63-67. Catalog No. 1142-0021, N2.N4-Bis(3-chlorophenyl)-5-fluoro-2,4- Trinus et al. 1970, "Correlation Between the Chemical Structure and pyrimidinediamine, commercially available from Contact Services/ Pharmacological Activity of Nitrogen-Containing Heterocyclic Chemdiv, San Diego, CA, Mar. 1, 2002. Guanidine Derivatives' Farmatsevitichinii Zhurnal (Kiev) 25(6):66 Catalog No. 1142-0024. N2.N4-Bis(2,5-dimethylphenyl)-5-fluoro 68. 2.4-pyrimidinediamine, commercially available from Contact Ser Zagulyaeva et al. 1978, “Relative reactivity of chlorine atoms in vices/Chemdiv, San Diego, CA, Mar. 1, 2002. 2,4-dichloropyrimidine in reactions with ammonia and amines in Catalog No. 1142-0026, N2.N4-Bis(4-ethoxyphenyl)-5-fluoro-2,4- isooctane and ethanol' Zhurnal Organicheskoi 14(2):409-13. pyrimidinediamine, commercially available from Contact Services/ U.S. Appl. No. 1 1/539,013, filed Oct. 5, 2006, Singh et al. Chemdiv, San Diego, CA, Mar. 1, 2002, Mar. 1, 2002. U.S. Appl. No. 1 1/539,018, filed Oct. 5, 2006, Singh et al. Catalog No. 1142-0027. N2.N4-Bis(3,4-dimethylphenyl)-5-fluoro U.S. Appl. No. 1 1/539,142, filed Oct. 5, 2006, Singh et al. 2.4-pyrimidinediamine, commercially available from Contact Ser U.S. Appl. No. 1 1/539,147, filed Oct. 5, 2006, Singh et al. vices/Chemdiv, San Diego, CA, Mar. 1, 2002. U.S. Appl. No. 1 1/539,520, filed Oct. 6, 2006, Singh et al. Catalog No. 1142-0031, N2.N4-Bis(2-methoxyphenyl)-5-fluoro U.S. Appl. No. 1 1/555,222, filed Oct. 31, 2006, Payan. 2.4-pyrimidinediamine, commercially available from Contact Ser U.S. Appl. No. 1 1/539,074, filed Oct. 5, 2006, Singh et al. vices/Chemdiv, San Diego, CA, Feb. 28, 2002. U.S. Appl. No. 1 1/782,581, filed Jul. 24, 2007, Singh et al. Catalog No. 1142-0033, N2,N4-Bisphenyl-5-fluoro-2,4- U.S. Appl. No. 1 1/875,772, filed Oct. 19, 2007, Lietal. pyrimidinediamine, commercially available from Contact Services/ U.S. Appl. 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Trieu et al. 2000, "A specific inhibitor of janus kinase-3 increases Sammond et al. 2005, "Discovery of a novel and potent series of Survival in a transgenic mouse model of amyotrophic lateral Sclero dianilinopyrimidineurea and urea isostere inhibitors of VEGFR2 sis' Biochem Biophys. Res. Commun. 267(1):22-25. tyrosine kinase” Bioorganic & Medicinal Chemistry Letters Tumas et al. 2001, “Anti-IgE efficacy in murine asthma models is 15(15):3519-3523. dependent on the method of allergen sensitization' J. Allergy Clin. Seidel et al. 2000, "Pharmaceutical intervention in the JAK/STAT Immunol. 107(6):1025-1033. signaling pathway.” Oncogene 19(21):2645-2656. Turhan et al. 1995 “Highly purified primitive hematopoietic stem Sewon et al. 2004, “Salivary calcium reflects skeletal bone density of cells are PML-RARA negative and generate nonclonal progenitors in heavy smokers' Arch. Oral Biol. 49(5):355-358. acute promyelocytic leukemia' Blood 85 (8):2154-2161. 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Simone 1996, “Oncology: Introduction', Cecil Textbook of Medi Weinstein et al. 1998, “Inhibition of osteoblastogenesis and promo cine 20th Ed., 1:1004-1010. tion of apoptosis of osteoblasts and osteocytes by glucocorticoids. Singh et al. 2004, CAPLUS Abstract 140:1993.34. Potential mechanisms of their deleterious effects on bone” J. Clin. Spangler et al. 2001, "Smokeless tobacco and osteoporosis: a new Invest. 102(2):274-282. relationship?” Med. Hypotheses 56(5):553-557. Wolff 1995 Burger's Medicinal Chemistry, 5th ed, vol. 1, John Wiley Sudbecket al. 1999, "Structure-based design of specific inhibitors of & Sons, pp.975-977. Janus kinase 3 as apoptosis-inducing antileukemic agents' Clin. Wong et al. 2004, “Targeting Syk as a treatment for allergic and Cancer Res. 5(6): 1569-1582. autoimmune disorders' Expert Opin. Investig. Drugs 13(7):743-762. Sugimoto et al. 2000, "A new model of allergic rhinitis in rats by Yu 1997, “Constitutive activation of the Janus kinase-STAT pathway topical sensitization and evaluation of H(1)-receptor antagonists' in T lymphoma overexpressing the Lck protein tyrosine kinase.” J Immunopharmacology 48(1):1-7. Immunol. 159(11):5206-5210. Suto et al. 1999, "NC/Nga mice: a mouse model for atopic Zwierzak and Kluba (1971) "Organophosphorus Esters-It-Butylas dermatitis' Int. Arch. Allergy Immunol. 120(Suppl 1):70-75. Protecting Group in Phosphorylation Via Nucleophilic Displace Suzuki etal. 2000, “Role of common cytokine receptor gamma chain ment Tetrahedron 27:3163-3170. (gamma(c))- and Jak3-dependent signaling in the proliferation and U.S. Appl. No. 12/193,627, filed Aug. 18, 2008, Li et al. survival of murine mast cells' Blood 96(6):2172-2180. U.S. Appl. No. 12/199,705, filed Aug. 27, 2008, Singh et al. Svensson et al. 1998, “B cell-deficient mice do not develop type II Balant et al. 1995, "Metabolic Considerations in Prodrug Design” collagen-induced arthritis (CIA).” Clin. Exp. Immunol. 1 11:521-526. Burger's Medicinal Chemistry and Drug Discovery, Fifth Ed. 1:949 Szalai et al. 2000, "The Arthus reaction in rodents: species-specific 982. requirement of complement” J. Immunol. 164(1):463-468. Guillory 1999, “Generation of Polymorphs, Hydrates, Solvates and Szelenyi et al. 2000, "Animal models of allergic rhinitis' Arzneimit Amorphous Solids' Polymorphism in Pharmaceutical Solids, Brit telforschung 50(11): 1037-1042. tained, Marcel Dekker, Inc., pp. 183-226. Takahashi et al. 2003, “S 12911-2 inhibits osteoclastic bone resorp tion in vitro” J. Bone Miner: Res. 18(6):1082-1087. * cited by examiner U.S. Patent May 15, 2012 Sheet 1 of 3 US 8,178,671 B2

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U.S. Patent May 15, 2012 Sheet 2 of 3 US 8,178,671 B2

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U.S. Patent May 15, 2012 Sheet 3 of 3 US 8,178,671 B2

US 8,178,671 B2 1. 2 METHODS OF TREATING OR PREVENTING AUTOIMMUNE DISEASES WITH 2, 6 4-PYRIMDINEDLAMINE COMPOUNDS sa NN 1. CROSS REFERENCE TO RELATED N 1. APPLICATION HN1 N 2 YNH,

This application claims benefit under 35 U.S.C. S 119(e) to The compounds of the invention are substituted at the C2 application Ser. No. 60/491,641, filed Jul. 30, 2003, Ser. No. 10 nitrogen (N2) to form a secondary amine and are optionally 60/531,598, filed Dec. 19, 2003 and Ser. No. 60/572,246, further substituted at one or more of the following positions: filed May 18, 2004. the C4 nitrogen (N4), the C5 position and/or the C6 position. When substituted at N4, the substituent forms a secondary 2. FIELD OF THE INVENTION amine. The substituent at N2, as well as the optional substitu 15 ents at the other positions, may range broadly in character and The present invention relates generally to 2.4-pyrim physico-chemical properties. For example, the Substituent(s) idinediamine compounds, pharmaceutical compositions may be a branched, straight-chained or cyclic alkyl, a comprising the compounds, intermediates and synthetic branched, straight-chained or cyclic heteroalkyl, a mono- or methods of making the compounds and methods of using the polycyclic aryla mono- or polycyclic heteroaryl or combina compounds and compositions in a variety of contexts, such as tions of these groups. These Substituent groups may be further in the treatment or prevention of autoimmune diseases and/or substituted, as will be described in more detail below. the symptoms associated therewith. The N2 and/or N4 substituents may be attached directly to 3. BACKGROUND OF THE INVENTION their respective nitrogen atoms, or they may be spaced away 25 from their respective nitrogen atoms via linkers, which may Crosslinking of Fc receptors, such as the high affinity be the same or different. The nature of the linkers can vary receptor for IgE (FceRI) and/or the high affinity receptor for widely, and can include virtually any combination of atoms or IgG (FcyRI) activates a signaling cascade in mast, basophil groups useful for spacing one molecular moiety from another. and other immune cells that results in the release of chemical For example, the linker may be an acyclic hydrocarbon bridge mediators responsible for numerous adverse events. For 30 (e.g., a Saturated or unsaturated alkyleno Such as methano, example, such crosslinking leads to the release of preformed ethano, etheno, propano, propleno, butano, butleno, but mediators of Type I (immediate) anaphylactic hypersensitiv 2eno, buta1,3dieno, and the like), a monocyclic or poly ity reactions, such as histamine, from storage sites in granules cyclic hydrocarbon bridge (e.g., 1.2 benzeno, 2.3naphtha via degranulation. It also leads to the synthesis and release of leno, and the like), a simple acyclic heteroatomic or other mediators, including leukotrienes, prostaglandins and 35 heteroalkyldiyl bridge (e.g., —O— —S— —S—O—, platelet-activating factors (PAFs), that play important roles in inflammatory reactions. Additional mediators that are synthe sized and released upon crosslinking Fc receptors include CH, O—CH2—, —O CH=CH-CH , and the cytokines and nitric oxide. like), a monocyclic or polycyclic heteroaryl bridge (e.g., 3.4 The signaling cascade(s) activated by crosslinking Fc 40 furano, pyridino, thiopheno, piperidino, piperazino, pyrazi receptors such as FceRI and/or FcyRI comprises an array of dino, pyrrolidino, and the like) or combinations of Such cellular proteins. Among the most important intracellular sig bridges. nal propagators are the tyrosine kinases. And, an important The substituents at the N2, N4, C5 and/or C6 positions, as tyrosine kinase involved in the signal transduction pathways 45 well as the optional linkers, may be further substituted with associated with crosslinking the FceRI and/or FcyRI recep one or more of the same or different substituent groups. The tors, as well as other signal transduction cascades, is Syk nature of these Substituent groups may vary broadly. Non kinase (see Valentet al., 2002, Intl.J. Hematol. 75(4): 257-362 limiting examples of Suitable Substituent groups include for review). branched, straight-chain or cyclic alkyls, mono- or polycyclic As the mediators released as a result of FceRI and FcyRI 50 aryls, branched, straight-chain or cyclic heteroalkyls, mono receptor cross-linking are responsible for, or play important or polycyclic heteroaryls, halos, branched, straight-chain or roles in, the manifestation of numerous adverse events, the cyclic haloalkyls, hydroxyls, oxos, thioxos, branched, availability of compounds capable of inhibiting the signaling straight-chain or cyclic alkoxys, branched, straight-chain or cascade(s) responsible for their release would be highly desir cyclic haloalkoxys, trifluoromethoxys, mono- or polycyclic able. Moreover, owing to the critical role that Syk kinase 55 aryloxys, mono- or polycyclic heteroaryloxys, ethers, alco plays these and other receptor signaling cascade(s), the avail hols, Sulfides, thioethers, Sulfanyls (thiols), imines, azos, ability of compounds capable of inhibiting Syk kinase would azides, amines (primary, secondary and tertiary), nitriles (any also be highly desirable. isomer), cyanates (any isomer), thiocyanates (any isomer), nitrosos, nitros, diazos, Sulfoxides, Sulfonyls, Sulfonic acids, 4. SUMMARY OF THE INVENTION 60 Sulfamides, Sulfonamides, Sulfamic esters, aldehydes, ketones, carboxylic acids, esters, amides, amidines, for In one aspect, the present invention provides novel 2.4- madines, amino acids, acetylenes, carbamates, lactones, lac pyrimidinediamine compounds that, as will be discussed in tams, glucosides, gluconurides, Sulfones, ketals, acetals, more detail below, have myriad biological activities. The thioketals, oximes, oxamic acids, oxamic esters, etc., and compounds generally comprise a 2.4-pyrimidinediamine 65 combinations of these groups. Substituent groups bearing “core' having the following structure and numbering conven reactive functionalities may be protected or unprotected, as is tion: well-known in the art. US 8,178,671 B2 3 4 In one illustrative embodiment, the 2.4-pyrimidinediamine homopiperazinyl, piperidinyl, 4-11 membered cyclohet compounds of the invention are compounds according to eroalkylalkyl, 5-10 membered heteroaryland 6-16 membered structural formula (I): heteroarylalkyl; each R is a suitable group independently selected from the group consisting of =O, —OR". (C1-C3) haloalkyloxy, R6 OCF =S, SR, —NR", =NOR, NRR, halogen, CF, CN, NC, OCN, -SCN, NO, NO, —N, R - N - S(O)R', S(O).R. S(O)OR, S(O)NR'R'', 21 N - S(O)NR'R'', OS(O)R, OS(O),R, OS(O),OR, L2 S. ls L 10 OS(O)NRR, C(O)R, C(O)OR, C(O)NR'R'', R41 SN N N1 NR2 C(NH)NR'R'', C(NR)NRR, C(NOH)R", C(NOH)NR'R'', OC(O)R, OC(O)OR, OC(O) NRR, OC(NH)NR'R'', OC(NR)NRR, NHC including salts, hydrates, Solvates and N-oxides thereof, (O) R', -NRC(O)I.R., -NHC(O)IOR, NRC wherein: 15 (O), OR, -NHC(O)NRR, NRC(O)NRR, L' and L are each, independently of one another, selected -NHC(NH))NR'R'' and -NRC(NR)NR'R'': from the group consisting of a direct bond and a linker; each R is independently a protecting group or R', or, Rand Rare described infra: alternatively, each R is taken together with the nitrogenatom R is selected from the group consisting of R. (C1-C6) to which it is bonded to form a 5 to 8-membered cyclohet alkyl optionally substituted with one or more of the same or eroalkyl or heteroaryl which may optionally include one or different R groups, (C1-C4) alkanyl optionally substituted more of the same or different additional heteroatoms and with one or more of the same or different R groups, (C2-C4) which may optionally be substituted with one or more of the alkenyl optionally substituted with one or more of the same or same or different R or suitable R groups; different R groups and (C2-C4) alkynyl optionally substi each R" is independently a protecting group or R': 25 each m is independently an integer from 1 to 3; and tuted with one or more of the same or different R groups: each n is independently an integer from 0 to 3. each R is independently selected from the group consist In one embodiment, R is F and R is hydrogen. ing of hydrogen, an electronegative group, —OR', SR', In another aspect, the present invention provides prodrugs (C1-C3) haloalkyloxy, (C1-C3) perhaloalkyloxy, —NRR, of the 2.4-pyrimidinediamine compounds. Such prodrugs halogen, (C1-C3) haloalkyl, (C1-C3) perhaloalkyl, —CF, 30 may be active in their prodrug form, or may be inactive until —CHCF, CFCF, CN, NC, OCN, - SCN, converted under physiological or other conditions of use to an - NO, —NO, —N. - S(O)R, —S(O), R, —S(O)OR, active drug form. In the prodrugs of the invention, one or more S(O)NRR, S(O)NRR, OS(O)R’, OS(O).R. functional groups of the 2.4-pyrimidinediamine compounds –OS(O), OR, OS(O)NR'R'', OS(O)NR'R'', C(O) are included in promoieties that cleave from the molecule R, C(O)OR, C(O)NR'R'', C(NH)NR'R'', OC(O) 35 under the conditions of use, typically by way of hydrolysis, R', SC(O)R, OC(O)OR, SC(O)OR, OC(O)NR enzymatic cleavage or some other cleavage mechanism, to R, SC(O)NR'R'', OC(NH)NR'R', SC(NH)NR'R'', yield the functional groups. For example, primary or second -NHC(O)I.R., -NHC(O)IOR, -NHC(O)NRR ary amino groups may be included in an amide promoiety that and -NHC(NH)NR'R'', (C5-C10) aryl optionally substi cleaves under conditions of use to generate the primary or tuted with one or more of the same or different R groups, 40 secondary amino group. Thus, the prodrugs of the invention phenyl optionally substituted with one or more of the same or include special types of protecting groups, termed “pro different R groups, (C6-C16) arylalkyl optionally substi groups.” masking one or more functional groups of the 2,4- tuted with one or more of the same or different R groups, pyrimidinediamine compounds that cleave under the condi 5-10 membered heteroaryl optionally substituted with one or tions of use to yield an active 2.4-pyrimidinediamine drug more of the same or different R groups and 6-16 membered 45 compound. Functional groups within the 2.4-pyrimidinedi heteroarylalkyl optionally substituted with one or more of the amine compounds that may be masked with progroups for same or different R groups: inclusion in a promoiety include, but are not limited to, R is selected from the group consisting of R. R. R. amines (primary and secondary), hydroxyls, Sulfanyls (thi substituted with one or more of the same or different R or R', ols), carboxyls, carbonyls, phenols, catechols, diols, alkynes, —OR substituted with one or more of the same or different 50 phosphates, etc. Myriad progroups suitable for masking Such R" or R', B(OR), B(NRR), -(CH), R, functional groups to yield promoieties that are cleavable -(CHR), R, O—(CH), R, S-(CH2), R. under the desired conditions of use are known in the art. All of - O CHRR, O CR(R) - O (CHR), R, these progroups, alone or in combinations, may be included -O-(CH), CH (CH), RR, S-(CHR), R, in the prodrugs of the invention. Specific examples of pro —C(O)NH-(CH), R, C(O)NH-(CHR), R, 55 moieties that yield primary or secondary amine groups that O—(CH), C(O)NH-(CH) R', S (CH), C can be included in the prodrugs of the invention include, but (O)NH-(CH), R, -O-(CHR), C(O)NH are not limited to amides, carbamates, imines, ureas, phos (CHR), R, S (CHR), C(O)NH-(CHR), R, phenyls, phosphoryls and Sulfenyls. Specific examples of NH-(CH), R, NH-(CHR), R, NH promoieties that yield Sulfanyl groups that can be included in (CH), RI, N(CH),R, -NH C(O) NH 60 the prodrugs of the invention include, but are not limited to, (CH), R. NH C(O)–(CH), CHRR and thioethers, for example S-methyl derivatives (monothio. NH-(CH2), C(O) NH-(CH), R: dithio, oxythio, aminothio acetals), silyl thioethers, each R" is independently selected from the group consist thioesters, thiocarbonates, thiocarbamates, asymmetrical dis ing of hydrogen, (C1-C6) alkyl, (C3-C8) cycloalkyl, cyclo ulfides, etc. Specific examples of promoieties that cleave to hexyl, (C4-C11) cycloalkylalkyl, (C5-C10) aryl, phenyl, (C6 65 yield hydroxyl groups that can be included in the prodrugs of C16) arylalkyl, benzyl, 2-6 membered heteroalkyl, 3-8 the invention include, but are not limited to, Sulfonates, esters membered cycloheteroalkyl, morpholinyl, piperazinyl, and carbonates. Specific examples of promoieties that yield US 8,178,671 B2 5 6 carboxyl groups that can be included in the prodrugs of the invention included, but are not limited to, esters (including R6 silyl esters, oxamic acid esters and thioesters), amides and hydrazides. R In one illustrative embodiment, the prodrugs of the inven tion are compounds according to structural formula (I) in N ls L which the protecting group of R and R is a progroup. R7 r N r NR2 In another illustrative embodiment, the prodrugs of the invention are compounds according to structural formula (II): R6 10 including salts, hydrates, Solvates and N-oxides thereof, R wherein R. R. Rand L'areas previously defined for struc 21 NN tural formula (I), R is an amino or hydroxyl group and R is L2 S. ls L hydrogen or a progroup. 41N N r NR2 In another embodiment, the intermediates are N4-substi 15 tuted cytosines according to structural formula (VI): R6 including salts, hydrates, Solvates and N-oxides thereof, R wherein: 21 NN R. R. R. R. L. and L are as previously defined for structural formula (I); R4 -IS N N 1sO R’ is a progroup; R" is progroup or an alkyl group, e.g., methyl, and as R4c further defined by the examples. including salts, hydrates, Solvates and N-oxides thereof, In another aspect, the present invention provides composi 25 wherein R. R. Rand L areas previously defined for struc tions comprising one or more compounds and/or prodrugs of tural formula (I) and R is as previously defined in formula the invention and an appropriate carrier, excipient or diluent. (III). The exact nature of the carrier, excipient or diluent will In yet another aspect, the present invention provides meth depend upon the desired use for the composition, and may ods of synthesizing the 2.4-pyrimidinediamine compounds range from being Suitable or acceptable for veterinary uses to 30 and prodrugs of the invention. In one embodiment, the being Suitable or acceptable for human use. method involves reacting a 4-pyrimidineamine according to In still another aspect, the present invention provides inter structural formula (III) with an amine of the formula HRN mediates useful for synthesizing the 2.4-pyrimidinediamine L'-R, where L', R and R are as previously defined for compounds and prodrugs of the invention. In one embodi structural formula (IV) to yield a 2.4-pyrimidinediamine ment, the intermediates are 4-pyrimidineamines according to 35 according to structural formula (I) or a prodrug according to structural formula (III): structural formula (II). R6 In another embodiment, the method involves reacting a R 2-pyrimidineamine according to structural formula (IV) with a NN an amine of the formula R-L-NHR" where L', Rand R' are as previously defined for structural formula (III) to yield a 40 2.4-pyrimidinediamine according to structural formula (I) or R41"YNis ls N us LG a prodrug according to structural formula (II). In yet another embodiment, the method involves reacting a 4-amino-2-pyrimidineamine according to structural formula (V) (in which R" is an amino group) with an amine of the including salts, hydrates, Solvates and N-oxides thereof, 45 formula R-L-NHR, where L. RandR areas defined for wherein R. R. Rand L areas previously defined for struc structural formula (III), to yield a 2.4-pyrimidinediamine tural formula (I); LG is a leaving group Such as, for example, according to structural formula (I) or a prodrug according to —S(O), Me, SMe or halo (e.g., F, Cl, Br, I); and R is structural formula (II). Alternatively, the 4-amino-2-pyrim hydrogen, a progroup, an alkyl group or as described herein. idineamine may be reacted with a compound of the formula In another embodiment, the intermediates are 2-pyrim 50 R-L-LG, where R and L are as previously defined for idineamines according to structural formula (IV): structural formula (I) and LG is a leaving group. R6 In still another embodiment, the method involves haloge nating a 4-hydroxy-2-pyrimidineamine according to struc R tural formula (V) (R’ is a hydroxyl group) to yield a 2-pyri 55 midlineamine according to structural formula (IV) and N ls L reacting this pyrimidineamine with an appropriate amine, as LG N r NR2 described above. In yet another embodiment, the method involves haloge nating an N4-Substituted cytosine according to structural for 60 mula (VI) to yield a 4-pyrimidineamine according to struc including salts, hydrates, Solvates and N-oxides thereof, tural formula (III) and reacting this pyrimidineamine with an wherein R. R. Rand L'areas previously defined for struc appropriate amine, as described above. tural formula (I); LG is a leaving group, Such as, for example, The 2.4-pyrimidinediamine compounds of the invention —S(O) Me. —SMe or halo (e.g., F. Cl, Br, I) and. are potent inhibitors of degranulation of immune cells, such In yet another embodiment, the intermediates are 4-amino 65 as mast, basophil, neutrophiland/or eosinophil cells. Thus, in or 4-hydroxy-2-pyrimidineamines according to structural still another aspect, the present invention provides methods of formula (V): regulating, and in particular inhibiting, degranulation of Such US 8,178,671 B2 7 8 cells. The method generally involves contacting a cell that tivity reactions include, but are not limited to, anaphylactic degranulates with an amount of a 2.4-pyrimidinediamine reactions to environmental and other allergens (e.g., pollens, compound or prodrug of the invention, or an acceptable salt, insect and/or animal venoms, foods, drugs, contrast dyes, hydrate, solvate, N-oxide and/or composition thereof, effec etc.), anaphylactoid reactions, hay fever, allergic conjunctivi tive to regulate or inhibit degranulation of the cell. The tis, allergic rhinitis, allergic asthma, atopic dermatitis, method may be practiced in in vitro contexts or in in vivo eczema, urticaria, mucosal disorders, tissue disorders and contexts as a therapeutic approach towards the treatment or certain gastrointestinal disorders. prevention of diseases characterized by, caused by or associ The immediate release of the preformed mediators via ated with cellular degranulation. degranulation is followed by the release and/or synthesis of a While not intending to be bound by any theory of opera 10 variety of other chemical mediators, including, among other tion, biochemical data confirm that the 2.4-pyrimidinedi things, platelet activating factor (PAF), prostaglandins and amine compounds exert their degranulation inhibitory effect, leukotrienes (e.g., LTC4) and the de novo synthesis and at least in part, by blocking or inhibiting the signal transduc release of cytokines such as TNFO, IL-4, IL-5, IL-6, IL-13, tion cascade(s) initiated by crosslinking of the high affinity Fc etc. The first of these two processes occurs approximately receptors for IgE (“FceRI) and/or IgG (“FeyRI). Indeed, the 15 3-30 min. following receptor activation; the latter approxi 2.4-pyrimidinediamine compounds are potent inhibitors of mately 30 min.-7 hrs. following receptor activation. These both FceRI-mediated and FcyRI-mediated degranulation. As “late stage' mediators are thought to be in part responsible for a consequence, the 2.4-pyrimidine compounds may be used the chronic symptoms of the above-listed atopic and Type I to inhibit these Fc receptor signalling cascades in any cell hypersensitivity reactions, and in addition are chemical type expressing such FceRI and/or FcyRI receptors including mediators of inflammation and inflammatory diseases (e.g., but not limited to macrophages, mast, basophil, neutrophil osteoarthritis, inflammatory bowel disease, ulcerative colitis, and/or eosinophil cells. Crohn's disease, idiopathic inflammatory bowel disease, irri The methods also permit the regulation of, and in particular table bowel syndrome, spastic colon, etc.), low grade Scarring the inhibition of downstream processes that result as a con (e.g., Scleroderma, increased fibrosis, keloids, post-Surgical sequence of activating such Fc receptor signaling cascade(s). 25 Scars, pulmonary fibrosis, vascular spasms, migraine, reper Such downstream processes include, but are not limited to, fusion injury and post myocardial infarction), and sicca com FceRI-mediated and/or FcyRI-mediated degranulation, plex or syndrome. All of these diseases may be treated or cytokine production and/or the production and/or release of prevented according to the methods of the invention. lipid mediators such as leukotrienes and prostaglandins. The Additional diseases which can be treated or prevented method generally involves contacting a cell expressing an Fc 30 according to the methods of the invention include diseases receptor, such as one of the cell types discussed above, with associated with basophil cell and/or mast cell pathology. an amount of a 2.4-pyrimidinediamine compound or prodrug Examples of such diseases include, but are not limited to, of the invention, oran acceptable salt, hydrate, solvent, N-ox diseases of the skin Such as Scleroderma, cardiac diseases ide and/or composition thereof, effective to regulate or inhibit Such as post myocardial infarction, pulmonary diseases Such the Fc receptor signaling cascade and/or a downstream pro 35 as pulmonary muscle changes or remodeling and chronic cess effected by the activation of this signaling cascade. The obstructive pulmonary disease (COPD) and diseases of the method may be practiced in in vitro contexts or in in vivo gut such as inflammatory bowel syndrome (spastic colon). contexts as a therapeutic approach towards the treatment or The 2.4-pyrimidinediamine compounds of the invention prevention of diseases characterized by, caused by or associ are also potent inhibitors of the tyrosine kinase Syk kinase. ated with the Fc receptor signaling cascade, Such as diseases 40 Thus, in still another aspect, the present invention provides effected by the release of granule specific chemical mediators methods of regulating, and in particular inhibiting, Syk upon degranulation, the release and/or synthesis of cytokines kinase activity. The method generally involves contacting a and/or the release and/or synthesis of lipid mediators such as Syk kinase or a cell comprising a Syk kinase with an amount leukotrienes and prostaglandins. of a 2.4-pyrimidinediamine compound or prodrug of the In yet another aspect, the present invention provides meth 45 invention, or an acceptable salt, hydrate, Solvate, N-oxide ods of treating and/or preventing diseases characterized by, and/or composition thereof, effective to regulate or inhibit caused by or associated with the release of chemical media Syk kinase activity. In one embodiment, the Syk kinase is an tors as a consequence of activating Fc receptor signaling isolated or recombinant Syk kinase. In another embodiment, cascades, such as FceRI and/or FcyRI-signaling cascades. the Syk kinase is an endogenous or recombinant Syk kinase The methods may be practiced in animals in Veterinary con 50 expressed by a cell, for example a mast cell or a basophil cell. texts or in humans. The methods generally involve adminis The method may be practiced in in vitro contexts or in in vivo tering to an animal Subject or human an amount of a 2.4- contexts as a therapeutic approach towards the treatment or pyrimidinediamine compound or prodrug of the invention, or prevention of diseases characterized by, caused by or associ an acceptable salt, hydrate, Solvate, N-oxide and/or compo ated with Syk kinase activity. sition thereof, effective to treat or prevent the disease. As 55 While not intending to be bound by any particular theory of discussed previously, activation of the FceRI or FcyRI recep operation, it is believed that the 2.4-pyrimidinediamine com tor signaling cascade in certain immune cells leads to the pounds of the invention inhibit cellular degranulation and/or release and/or synthesis of a variety of chemical Substances the release of other chemical mediators primarily by inhibit that are pharmacological mediators of a wide variety of dis ing Syk kinase that gets activated through the gamma chain eases. Any of these diseases may be treated or prevented 60 homodimer of FceRI (see, e.g., FIG. 2). This gamma chain according to the methods of the invention. homodimer is shared by other Fc receptors, including FcyRI, For example, in mast cells and basophil cells, activation of Fcy III and FcoRI. For all of these receptors, intracellular the FceRI or FcyRI signaling cascade leads to the immediate signal transduction is mediated by the common gamma chain (i.e., within 1-3 min. of receptor activation) release of pre homodimer. Binding and aggregation of those receptors formed mediators of atopic and/or Type I hypersensitivity 65 results in the recruitment and activation of tyrosine kinases reactions (e.g., histamine, proteases such as tryptase, etc.) via Such as Syk kinase. As a consequence of these common the degranulation process. Such atopic or Type I hypersensi signaling activities, the 2.4-pyrimidinediamine compounds US 8,178,671 B2 9 10 described herein may be used to regulate, and in particular diseases frequently designated as single organ or single cell inhibit, the signaling cascades of Fc receptors having this type autoimmune disorders include: Hashimoto's thyroiditis, gamma chain homodimer, such as FceRI, FcyRI. FcyRIII and autoimmune hemolytic anemia, autoimmune atrophic gastri FcCRI, as well as the cellular responses elicited through these tis of pernicious anemia, autoimmune encephalomyelitis, receptors. autoimmune orchitis, Goodpasture's disease, autoimmune Sykkinase is known to play a critical role in other signaling thrombocytopenia, sympathetic ophthalmia, myasthenia cascades. For example, Syk kinase is an effector of B-cell gravis, Graves disease, primary biliary cirrhosis, chronic receptor (BCR) signaling (Turner et al., 2000, Immunology aggressive hepatitis, ulcerative colitis and membranous Today 21:148-154) and is an essential component of integrin glomerulopathy. Non-limiting examples of diseases often beta(1), beta(2) and beta(3) signaling in neutrophils (Mocsai 10 et al., 2002, Immunity 16:547-558). As the 2.4-pyrimidinedi designated as involving systemic autoimmune disorder amine compounds described herein are potent inhibitors of include: Systemic lupus erythematosis, rheumatoid arthritis, Syk kinase, they can be used to regulate, and in particular Sjogren's syndrome, Reiter's syndrome, polymyositis-der inhibit, any signaling cascade where Syk plays a role, such as, matomyositis, systemic sclerosis, polyarteritis nodosa, mul fore example, the Fc receptor, BCR and integrin signaling 15 tiple Sclerosis and bullous pemphigoid. cascades, as well as the cellular responses elicited through these signaling cascades. The particular cellular response 5. BRIEF DESCRIPTION OF THE FIGURES regulated or inhibited will depend, in part, on the specific cell type and receptor signaling cascade, as is well known in the FIG. 1 provides a cartoon illustrating allergen-induced pro art. Non-limiting examples of cellular responses that may be duction of IgE and consequent release of preformed and other regulated or inhibited with the 2.4-pyrimidinediamine com chemical mediators from mast cells; pounds include a respiratory burst, cellular adhesion, cellular FIG. 2 provides a cartoon illustrating the FceR' signal degranulation, cell spreading, cell migration, phagocytosis transduction cascade leading to degranulation of mast and/or (e.g., in macrophages), calcium ion flux (e.g., in mast, baso basophil cells; and phil, neutrophil, eosinophiland B-cells), plateletaggregation, 25 FIG.3 provides a cartoon illustrating the putative points of and cell maturation (e.g., in B-cells). action of compounds that selectively inhibit upstream FceRI Thus, in another aspect, the present invention provides mediated degranulation and compounds that inhibit both methods of regulating, and in particular inhibiting, signal FceRI-mediated and ionomycin-induced degranulation. transduction cascades in which Syk plays a role. The method generally involves contacting a Syk-dependent receptor or a 30 6. DETAILED DESCRIPTION OF THE cell expressing a Syk-dependent receptor with an amount of a PREFERRED EMBODIMENTS 2.4-pyrimidinediamine compound or prodrug of the inven tion, or an acceptable salt, hydrate, Solvate, N-oxide and/or 6.1 Definitions composition thereof, effective to regulate or inhibit the signal transduction cascade. The methods may also be used to regu 35 As used herein, the following terms are intended to have late, and in particular inhibit, downstream processes or cel the following meanings: lular responses elicited by activation of the particular Syk Alkyl by itself or as part of another substituent refers to dependent signal transduction cascade. The methods may be a saturated or unsaturated branched, straight-chain or cyclic practiced to regulate any signal transduction cascade where monovalent hydrocarbon radical having the stated number of Syk is not known or later discovered to play a role. The 40 carbonatoms (i.e., C1-C6 means one to six carbonatoms) that methods may be practiced in in vitro contexts or in in vivo is derived by the removal of one hydrogenatom from a single contexts as a therapeutic approach towards the treatment or carbon atom of a parent alkane, alkene or alkyne. Typical prevention of diseases characterized by, caused by or associ alkyl groups include, but are not limited to, methyl, ethyls ated with activation of the Syk-dependent signal transduction Such as ethanyl, ethenyl, ethynyl; propyls such as propan-1- cascade. Non-limited examples of Such diseases include 45 yl, propan-2-yl, cyclopropan-1-yl, prop-1-en-1-yl, prop-1- those previously discussed. en-2-yl, prop-2-en-1-yl, cycloprop-1-en-1-yl, cycloprop-2- Cellular and animal data also confirm that the 2.4-pyrim en-1-yl, prop-1-yn-1-yl, prop-2-yn-1-yl, etc.; butyls such as idinediamine compounds of the invention may also be used to butan-1-yl, butan-2-yl, 2-methyl-propan-1-yl, 2-methyl-pro treat or prevent autoimmune diseases and/or symptoms of pan-2-yl, cyclobutan-1-yl, but-1-en-1-yl, but-1-en-2-yl, Such diseases. The methods generally involve administering 50 2-methyl-prop-1-en-1-yl, but-2-en-1-yl, but-2-en-2-yl, buta to a subject Suffering from an autoimmune disease or at risk of 1,3-dien-1-yl, buta-1,3-dien-2-yl, cyclobut-1-en-1-yl, developing an autoimmune disease an amount of a 2.4-pyri cyclobut-1-en-3-yl, cyclobuta-1,3-dien-1-yl, but-1-yn-1-yl, midinediamine method or prodrug of the invention, or an but-1-yn-3-yl, but-3-yn-1-yl, etc.; and the like. Where spe acceptable salt, N-oxide, hydrate, Solvate or composition cific levels of Saturation are intended, the nomenclature thereof, effective to treat or prevent the autoimmune disease 55 “alkanyl.” “alkenyl and/or “alkynyl is used, as defined and/or its associated symptoms. Autoimmune diseases that below. In preferred embodiments, the alkyl groups are (C1 can be treated or prevented with the 2.4-pyrimidinediamine C6) alkyl. compounds include those diseases that are commonly asso “Alkanyl by itselforas part of another substituent refers to ciated with nonanaphylactic hypersensitivity reactions (Type a saturated branched, straight-chain or cyclic alkyl derived by II, Type III and/or Type IV hypersensitivity reactions) and/or 60 the removal of one hydrogenatom from a single carbonatom those diseases that are mediated, at least in part, by activation of a parent alkane. Typical alkanyl groups include, but are not of the FcyR signaling cascade in monocyte cells. Such limited to, methanyl; ethanyl; propanyls such as propan-1-yl, autoimmune disease include, but are not limited to, those propan-2-yl (isopropyl), cyclopropan-1-yl, etc.; butanyls autoimmune diseases that are frequently designated as single Such as butan-1-yl, butan-2-yl (sec-butyl), 2-methyl-propan organ or single cell-type autoimmune disorders and those 65 1-yl (isobutyl), 2-methyl-propan-2-yl (t-butyl), cyclobutan autoimmune disease that are frequently designated as involv 1-yl, etc.; and the like. In preferred embodiments, the alkanyl ing systemic autoimmune disorder. Non-limiting examples of groups are (C1-C6) alkanyl. US 8,178,671 B2 11 12 Alkenyl by itselforas part of another substituent refers to or alkyne. The locant of a double bond or triple bond, if an unsaturated branched, straight-chain or cyclic alkyl having present, in a particular alkyleno is indicated in square brack at least one carbon-carbon double bond derived by the ets. Typical alkyleno groups include, but are not limited to, removal of one hydrogen atom from a single carbon atom of methano; ethylenos Such as ethano, etheno, ethyno, propyle a parent alkene. The group may be in either the cis or trans 5 noS Such as propano, propleno, propa 1.2dieno, prop1 conformation about the double bond(s). Typical alkenyl yno, etc.; butylenos such as butano, butleno, but 2eno, groups include, but are not limited to, ethenyl; propenyls such buta1,3dieno, but lyno, but 2yno, buta 1.3diyno, etc.; as prop-1-en-1-yl, prop-1-en-2-yl, prop-2-en-1-yl, prop-2- and the like. Where specific levels of saturation are intended, en-2-yl, cycloprop-1-en-1-yl; cycloprop-2-en-1-yl; butenyls the nomenclature alkano, alkeno and/or alkyno is used. In Such as but-1-en-1-yl, but-1-en-2-yl, 2-methyl-prop-1-en-1- 10 preferred embodiments, the alkyleno group is (C1-C6) or y1, but-2-en-1-yl, but-2-en-2-yl, buta-1,3-dien-1-yl, buta-1,3- (C1-C3) alkyleno. Also preferred are straight-chain saturated dien-2-yl, cyclobut-1-en-1-yl, cyclobut-1-en-3-yl, cyclobuta alkano groups, e.g., methano, ethano, propano, butano, and 1,3-dien-1-yl, etc.; and the like. In preferred embodiments, the like. the alkenyl group is (C2-C6) alkenyl. “Heteroalkyl.” Heteroalkanyl.” Heteroalkenyl.” Het Alkynyl by itselforas part of another substituent refers to 15 eroalkynyl. Heteroalkyldiyl and “Heteroalkyleno’ by an unsaturated branched, straight-chain or cyclic alkyl having themselves or as part of another substituent refer to alkyl, at least one carbon-carbon triple bond derived by the removal alkanyl, alkenyl, alkynyl, alkyldiyl and alkyleno groups, of one hydrogen atom from a single carbon atom of a parent respectively, in which one or more of the carbon atoms are alkyne. Typical alkynyl groups include, but are not limited to, each independently replaced with the same or different het ethynyl; propynyls such as prop-1-yn-1-yl, prop-2-yn-1-yl, eratoms or heteroatomic groups. Typical heteroatoms and/or etc.; butynyls such as but-1-yn-1-yl, but-1-yn-3-yl, but-3-yn heteroatomic groups which can replace the carbon atoms 1-yl, etc.; and the like. In preferred embodiments, the alkynyl include, but are not limited to. —O— —S , —S—O—, group is (C2-C6) alkynyl. NR' , -PH-, -S(O)-, -S(O) , S(O)NR' , Alkyldiyl by itselfor as part of another substituent refers —S(O)NR' , and the like, including combinations thereof, to a saturated or unsaturated, branched, straight-chain or 25 where each R" is independently hydrogen or (C1-C6) alkyl. cyclic divalent hydrocarbon group having the stated number “Cycloalkyl and “Heterocycloalkyl by themselves or as of carbon atoms (i.e., C1-C6 means from one to six carbon part of another substituent refer to cyclic versions of “alkyl atoms) derived by the removal of one hydrogen atom from and "heteroalkyl groups, respectively. For heteroalkyl each of two different carbon atoms of a parent alkane, alkene groups, a heteroatom can occupy the position that is attached or alkyne, or by the removal of two hydrogen atoms from a 30 to the remainder of the molecule. Typical cycloalkyl groups single carbon atom of a parent alkane, alkene or alkyne. The include, but are not limited to, cyclopropyl, cyclobutyls. Such two monovalent radical centers or each valency of the diva as cyclobutanyl and cyclobutenyl cyclopentyls such as lent radical center can form bonds with the same or different cyclopentanyl and cyclopentenyl, cyclohexyls such as cyclo atoms. Typical alkyldiyl groups include, but are not limited hexanyl and cyclohexenyl; and the like. Typical heterocy to, methandiyl; ethyldiyls such as ethan-1,1-diyl ethan-1,2- 35 cloalkyl groups include, but are not limited to, tetrahydrofura diyl ethen-1,1-diyl ethen-1,2-diyl; propyldiyls such as pro nyl (e.g., tetrahydrofuran-2-yl, tetrahydrofuran-3-yl, etc.), pan-1,1-diyl, propan-1,2-diyl, propan-2,2-diyl, propan-1,3- piperidinyl (e.g., piperidin-1-yl, piperidin-2-yl, etc.), mor diyl, cyclopropan-1,1-diyl, cyclopropan-1,2-diyl, prop-1-en pholinyl (e.g., morpholin-3-yl, morpholin-4-yl, etc.), piper 1,1-diyl, prop-1-en-1,2-diyl, prop-2-en-1,2-diyl, prop-1-en azinyl (e.g., piperazin-1-yl, piperazin-2-yl, etc.), and the like. 1,3-diyl, cycloprop-1-en-1,2-diyl, cycloprop-2-en-1,2-diyl. 40 Acyclic Heteroatomic Bridge” refers to a divalent bridge cycloprop-2-en-1,1-diyl, prop-1-yn-1,3-diyl, etc.; butyldiyls in which the backbone atoms are exclusively heteroatoms Such as, butan-1,1-diyl, butan-1,2-diyl, butan-1,3-diyl, butan and/or heteroatomic groups. Typical acyclic heteroatomic 1,4-diyl, butan-2.2-diyl, 2-methyl-propan-1,1-diyl 2-me bridges include, but are not limited to. —O— —S—, thyl-propan-1,2-diyl, cyclobutan-1,1-diyl; cyclobutan-1,2- S—O—, NR' , PH , S(O) , S(O) , diyl, cyclobutan-1,3-diyl, but-1-en-1,1-diyl, but-1-en-1,2- 45 —S(O)NR' , —S(O)NR' , and the like, including com diyl, but-1-en-1,3-diyl, but-1-en-1,4-diyl, 2-methyl-prop-1- binations thereof, where each R" is independently hydrogen en-1,1-diyl 2-methanylidene-propan-1,1-diyl, buta-1,3- or (C1-C6) alkyl. dien-1,1-diyl, buta-1,3-dien-1,2-diyl, buta-1,3-dien-1,3-diyl. “Parent Aromatic Ring System” refers to an unsaturated buta-1,3-dien-1,4-diyl, cyclobut-1-en-1,2-diyl, cyclobut-1- cyclic or polycyclic ring system having a conjugated telec en-1,3-diyl, cyclobut-2-en-1,2-diyl, cyclobuta-1,3-dien-1,2- 50 tron system. Specifically included within the definition of diyl, cyclobuta-1,3-dien-1,3-diy1, but-1-yn-1,3-diyl, but-1- "parent aromatic ring system” are fused ring systems in yn-1,4-diyl, buta-1,3-diyn-1,4-diyl, etc.; and the like. Where which one or more of the rings are aromatic and one or more specific levels of Saturation are intended, the nomenclature of the rings are Saturated or unsaturated. Such as, for example, alkanyldiyl, alkenyldiyl and/or alkynyldiyl is used. Where it fluorene, indane, indene, phenalene, tetrahydronaphthalene, is specifically intended that the two valencies are on the same 55 etc. Typical parent aromatic ring systems include, but are not carbon atom, the nomenclature “alkylidene' is used. In pre limited to, aceanthrylene, acenaphthylene, acephenan ferred embodiments, the alkyldiyl group is (C1-C6) alkyldiyl. thrylene, anthracene, aZulene, benzene, chrysene, coronene, Also preferred are Saturated acyclic alkanyldiyl groups in fluoranthene, fluorene, hexacene, hexaphene, hexalene, which the radical centers are at the terminal carbons, e.g., indacene, S-indacene, indane, indene, naphthalene, octacene, methandiyl (methano); ethan-1,2-diyl (ethano); propan-1,3- 60 octaphene, octalene, ovalene, penta-2,4-diene, pentacene, diyl (propano); butan-1,4-diyl (butano); and the like (also pentalene, pentaphene, perylene, phenalene, phenanthrene, referred to as alkylenos, defined infra). picene, pleiadene, pyrene, pyranthrene, rubicene, tetrahy Alkyleno’ by itself or as part of another substituent refers dronaphthalene, triphenylene, trinaphthalene, and the like, as to a straight-chain Saturated or unsaturated alkyldiyl group well as the various hydro isomers thereof. having two terminal monovalent radical centers derived by 65 Aryl by itself or as part of another substituent refers to a the removal of one hydrogen atom from each of the two monovalent aromatic hydrocarbon group having the stated terminal carbonatoms of straight-chain parent alkane, alkene number of carbon atoms (i.e., C5-C15 means from 5 to 15 US 8,178,671 B2 13 14 carbon atoms) derived by the removal of one hydrogen atom one or more of the rings are aromatic and one or more of the from a single carbon atom of a parent aromatic ring system. rings are saturated or unsaturated, such as, for example, ben Typical aryl groups include, but are not limited to, groups Zodioxan, benzofuran, chromane, chromene, indole, indo derived from aceanthrylene, acenaphthylene, acephenan line, xanthene, etc. Also included in the definition of “parent thrylene, anthracene, azulene, benzene, chrysene, coronene, heteroaromatic ring system” are those recognized rings that fluoranthene, fluorene, hexacene, hexaphene, hexalene, as include common Substituents, such as, for example, benzopy indacene, S-indacene, indane, indene, naphthalene, octacene, rone and 1-methyl-1,2,3,4-tetrazole. Specifically excluded octaphene, octalene, ovalene, penta-2,4-diene, pentacene, from the definition of “parent heteroaromatic ring system” pentalene, pentaphene, perylene, phenalene, phenanthrene, are benzene rings fused to cyclic polyalkylene glycols such as picene, pleiadene, pyrene, pyranthrene, rubicene, triph 10 enylene, trinaphthalene, and the like, as well as the various cyclic polyethylene glycols. Typical parent heteroaromatic hydro isomers thereof. In preferred embodiments, the aryl ring systems include, but are not limited to, acridine, benz group is (C5-C15) aryl, with (C5-C10) being even more pre imidazole, benzisoxazole, benzodioxan, benzodioxole, ben ferred. Particularly preferred aryls are cyclopentadienyl, phe Zofuran, benzopyrone, benzothiadiazole, benzothiazole, ben nyl and naphthyl. 15 Zotriazole, benzoxaxine, benzoxazole, benzoxazoline, Arylaryl' by itself or as part of another substituent refers carbazole, B-carboline, chromane, chromene, cinnoline, to a monovalent hydrocarbon group derived by the removal of furan, imidazole, indazole, indole, indoline, indolizine, one hydrogen atom from a single carbon atom of a ring isobenzofuran, isochromene, isoindole, isoindoline, iso system in which two or more identical or non-identical parent quinoline, isothiazole, isoxazole, naphthyridine, oxadiazole, aromatic ring systems are joined directly together by a single oxazole, perimidine, phenanthridine, phenanthroline, phena bond, where the number of Such direct ring junctions is one Zine, phthalazine, pteridine, purine, pyran, pyrazine, pyra less than the number of parent aromatic ring systems Zole, pyridazine, pyridine, pyrimidine, pyrrole, pyrrolizine, involved. Typical arylaryl groups include, but are not limited quinazoline, quinoline, quinolizine, quinoxaline, tetrazole, to, biphenyl, triphenyl, phenyl-naphthyl, binaphthyl, biphe thiadiazole, thiazole, thiophene, triazole, Xanthene, and the nyl-naphthyl, and the like. Where the number of carbonatoms 25 like. in an arylaryl group are specified, the numbers refer to the “Heteroaryl' by itself or as part of another substituent carbon atoms comprising each parent aromatic ring. For refers to a monovalent heteroaromatic group having the stated example, (C5-C15) arylaryl is an arylaryl group in which number of ring atoms (e.g., “5-14 membered’ means from 5 each aromatic ring comprises from 5 to 15 carbons, e.g., to 14 ring atoms) derived by the removal of one hydrogen biphenyl, triphenyl, binaphthyl, phenylnaphthyl, etc. Prefer 30 atom from a single atom of a parent heteroaromatic ring ably, each parent aromatic ring system of an arylaryl group is system. Typical heteroaryl groups include, but are not limited independently a (C5-C15) aromatic, more preferably a (C5 to, groups derived from acridine, benzimidazole, benzisox C10) aromatic. Also preferred are arylaryl groups in which all azole, benzodioxan, benzodiaXole, benzofuran, benzopy of the parent aromatic ring systems are identical, e.g., biphe rone, benzothiadiazole, benzothiazole, benzotriazole, ben nyl, triphenyl, binaphthyl, trinaphthyl, etc. 35 Zoxazine, benzoxazole, benzoxazoline, carbazole, “Biaryl by itself or as part of another substituent refers to B-carboline, chromane, chromene, cinnoline, furan, imida an arylaryl group having two identical parent aromatic sys Zole, indazole, indole, indoline, indolizine, isobenzofaran, tems joined directly together by a single bond. Typical biary1 isochromene, isoindole, isoindoline, isoquinoline, isothiaz groups include, but are not limited to, biphenyl, binaphthyl, ole, isoxazole, naphthyridine, oxadiazole, oxazole, perimi bianthracyl, and the like. Preferably, the aromatic ring sys 40 dine, phenanthridine, phenanthroline, phenazine, phthala tems are (C5-C15) aromatic rings, more preferably (C5-C10) Zine, pteridine, purine, pyran, pyrazine, pyrazole, pyridazine, aromatic rings. A particularly preferred biaryl group is biphe pyridine, pyrimidine, pyrrole, pyrrolizine, quinazoline, nyl. quinoline, quinolizine, quinoxaline, tetrazole, thiadiazole, Arylalkyl by itselfor as part of another substituent refers thiazole, thiophene, triazole, Xanthene, and the like, as well as to an acyclic alkyl group in which one of the hydrogenatoms 45 the various hydro isomers thereof. In preferred embodiments, bonded to a carbon atom, typically a terminal or sp carbon the heteroaryl group is a 5-14 membered heteroaryl, with atom, is replaced with an aryl group. Typical arylalkyl groups 5-10 membered heteroaryl being particularly preferred. include, but are not limited to, benzyl, 2-phenylethan-1-yl, “Heteroaryl-Heteroaryl' by itself or as part of another sub 2-phenylethen-1-yl, naphthylmethyl 2-naphthylethan-1-yl, stituent refers to a monovalent heteroaromatic group derived 2-naphthylethen-1-yl, naphthobenzyl, 2-naphthophenyle 50 by the removal of one hydrogenatom from a single atom of a than-1-yl and the like. Where specific alkyl moieties are ring system in which two or more identical or non-identical intended, the nomenclature arylalkanyl, arylakenyl and/or parent heteroaromatic ring systems are joined directly arylalkynyl is used. In preferred embodiments, the arylalkyl together by a single bond, where the number of such direct group is (C6-C21) arylalkyl, e.g., the alkanyl, alkenyl or ringjunctions is one less than the number of parentheteroaro alkynyl moiety of the arylalkyl group is (C1-C6) and the aryl 55 matic ring systems involved. Typical heteroaryl-heteroaryl moiety is (C5-C15). In particularly preferred embodiments groups include, but are not limited to, bipyridyl, tripyridyl, the arylalkyl group is (C6-C13), e.g., the alkanyl, alkenyl or pyridylpurinyl, bipurinyl, etc. Where the number of atoms are alkynyl moiety of the arylalkyl group is (C1-C3) and the aryl specified, the numbers refer to the number of atoms compris moiety is (C5-C10). ing each parent heteroaromatic ring systems. For example, “Parent Heteroaromatic Ring System” refers to a parent 60 5-15 membered heteroaryl-heteroaryl is a heteroaryl-het aromatic ring system in which one or more carbon atoms are eroaryl group in which each parent heteroaromatic ring sys each independently replaced with the same or different het tem comprises from 5 to 15 atoms, e.g., bipyridyl, tripuridyl, eroatoms or heteroatomic groups. Typical heteroatoms or etc. Preferably, each parent heteroaromatic ring system is heteroatomic groups to replace the carbon atoms include, but independently a 5-15 membered heteroaromatic, more pref are not limited to, N, NH, P. O, S, S(O), S(O), Si, etc. 65 erably a 5-10 membered heteroaromatic. Also preferred are Specifically included within the definition of “parent het heteroaryl-heteroaryl groups in which all of the parent het eroaromatic ring systems are fused ring systems in which eroaromatic ring systems are identical. US 8,178,671 B2 15 16 “Biheteroaryl' by itself or as part of another substituent quently, but not necessarily, pharmacologically inactive until refers to a heteroaryl-heteroaryl group having two identical converted into the active drug. Prodrugs are typically parent heteroaromatic ring systems joined directly together obtained by masking a functional group in the 2.4-pyrim by a single bond. Typical biheteroaryl groups include, but are idinediamine drug believed to be in part required for activity not limited to, bipyridyl, bipurinyl, biquinolinyl, and the like. with a progroup (defined below) to form a promoiety which Preferably, the heteroaromatic ring systems are 5-15 mem undergoes a transformation, Such as cleavage, under the bered heteroaromatic rings, more preferably 5-10 membered specified conditions of use to release the functional group, heteroaromatic rings. and hence the active 2.4-pyrimidinediamine drug. The cleav “Heteroarylalkyl by itself or as part of another substituent age of the promoiety may proceed spontaneously, such as by refers to an acyclic alkyl group in which one of the hydrogen 10 way of a hydrolysis reaction, or it may be catalyzed or atoms bonded to a carbon atom, typically a terminal or sp induced by another agent, Such as by an enzyme, by light, by carbon atom, is replaced with a heteroaryl group. Where acid or base, or by a change of or exposure to a physical or specific alkyl moieties are intended, the nomenclature het environmental parameter, such as a change of temperature. eroarylalkanyl, heteroarylakenyl and/or heteroarylalkynyl is The agent may be endogenous to the conditions of use. Such used. In preferred embodiments, the heteroarylalkyl group is 15 as an enzyme present in the cells to which the prodrug is a 6-21 membered heteroarylalkyl, e.g., the alkanyl, alkenyl or administered or the acidic conditions of the stomach, or it alkynyl moiety of the heteroarylalkyl is (C1-C6) alkyland the may be supplied exogenously. heteroaryl moiety is a 5-15-membered heteroaryl. In particu A wide variety of progroups, as well as the resultant pro larly preferred embodiments, the heteroarylalkyl is a 6-13 moieties, suitable for masking functional groups in the active membered heteroarylalkyl, e.g., the alkanyl, alkenyl or alky 2.4-pyrimidinediamines compounds to yield prodrugs are nyl moiety is (C1-C3) alkyl and the heteroaryl moiety is a well-known in the art. For example, a hydroxyl functional 5-10 membered heteroaryl. group may be masked as a Sulfonate, ester or carbonate pro "Halogen' or "Halo' by themselves or as part of another moiety, which may be hydrolyzed in vivo to provide the substituent, unless otherwise stated, refer to fluoro, chloro, hydroxyl group. An amino functional group may be masked bromo and iodo. 25 as an amide, carbamate, imine, urea, phosphenyl, phosphoryl "Haloalkyl by itself or as part of another substituent refers or sulfenyl promoiety, which may be hydrolyzed in vivo to to an alkyl group in which one or more of the hydrogenatoms provide the amino group. A carboxyl group may be masked as is replaced with a halogen. Thus, the term “haloalkyl is an ester (including silyl esters and thioesters), amide or meant to include monohaloalkyls, dihaloalkyls, trihaloalkyls, hydrazide promoiety, which may be hydrolyzed in vivo to etc. up to perhaloalkyls. For example, the expression "(C1 30 provide the carboxyl group. Nitrogen protecting groups and C2) haloalkyl includes fluoromethyl, difluoromethyl, trif nitrogen pro-drugs of the invention may include lower alkyl luoromethyl, 1-fluoroethyl, 1,1-difluoroethyl, 1,2-difluoroet groups as well as amides, carbamates, etc. Other specific hyl, 1,1,1-trifluoroethyl, perfluoroethyl, etc. examples of suitable progroups and their respective promoi The above-defined groups may include prefixes and/or Suf eties will be apparent to those of skill in the art. fixes that are commonly used in the art to create additional 35 “Progroup' refers to a type of protecting group that, when well-recognized substituent groups. As examples, “alkyloxy” used to mask a functional group within an active 2.4-pyrim or “alkoxy' refers to a group of the formula —OR", "alky idinediamine drug to form a promoiety, converts the drug into lamine” refers to a group of the formula NHR" and “dialky a prodrug. Progroups are typically attached to the functional lamine” refers to a group of the formula —NR"R", where group of the drug via bonds that are cleavable under specified each R" is independently an alkyl. As another example, 40 conditions of use. Thus, a progroup is that portion of a pro “haloalkoxy” or “haloalkyloxy' refers to a group of the for moiety that cleaves to release the functional group under the mula–OR", where R" is a haloalkyl. specified conditions of use. As a specific example, an amide “Protecting group' refers to a group of atoms that, when promoiety of the formula - NH C(O)CH comprises the attached to a reactive functional group in a molecule, mask, progroup —C(O)CH. reduce or prevent the reactivity of the functional group. Typi 45 “Fc Receptor refers to a member of the family of cell cally, a protecting group may be selectively removed as Surface molecules that binds the Fc portion (containing the desired during the course of a synthesis. Examples of protect specific constant region) of an immunoglobulin. Each Fc ing groups can be found in Greene and Wuts, Protective receptor binds immunoglobulins of a specific type. For Groups in Organic Chemistry, 3' Ed., 1999, John Wiley & example the FcC. receptor (“FcCR) binds IgA, the FceR Sons, NY and Harrison et al., Compendium of Synthetic 50 binds IgE and the FcyR binds IgG. Organic Methods, Vols. 1-8, 1971-1996, John Wiley & Sons, The FcCR family includes the polymeric Ig receptor NY. Representative amino protecting groups include, but are involved in epithelial transport of IgA/IgM, the mycloid spe not limited to, formyl, acetyl, trifluoroacetyl, benzyl, benzy cific receptor RcCRI (also called CD89), the FcC/uR and at loxycarbonyl (“CBZ), tert-butoxycarbonyl (“Boc), trim least two alternative IgA receptors (for a recent review see ethylsilyl (TMS), 2-trimethylsilyl-ethanesulfonyl 55 Monteiro & van de Winkel, 2003, Annu. Rev. Immunol, (“TES), trity1 and substituted trityl groups, allyloxycarbo advanced e-publication. The FcCRI is expressed on neutro nyl, 9-fluorenylmethyloxycarbonyl (“FMOC), nitro-vera phils, eosinophils, moncytes/macrophages, dendritic cells tryloxycarbonyl (“NVOC) and the like. Representative and kupfer cells. The FcCRI inclues one alpha chain and the hydroxyl protecting groups include, but are not limited to, FcRgamma homodimer that bears an activation motif those where the hydroxyl group is either acylated or alkylated 60 (ITAM) in the cytoplasmic domain and phosphorylates Syk such as benzyl and trityl ethers, as well as alkyl ethers, tet kinase. rahydropyranyl ethers, trialkylsilyl ethers (e.g., TMS or The FceR family includes two types, designated FceRI and TIPPS groups) and allyl ethers. FceRII (also known as CD23). FceRI is a high affinity recep “Prodrug” refers to a derivative of an active 2.4-pyrim tor (binds IgE with an affinity of about 10"M") found on idinediamine compound (drug) that requires a transformation 65 mast, basophil and eosinophil cells that anchors monomeric under the conditions of use, such as within the body, to release IgE to the cell surface. The FceRI possesses one alpha chain, the active 2.4-pyrimidinediamine drug. Prodrugs are fre one beta chain and the gamma chain homodimer discussed US 8,178,671 B2 17 18 above. The FceRII is a low affinity receptor expressed on naling cascade also leads to degranulation which may be mononuclear phagocytes, B lymphocytes, eosinophils and broken into the same two stages: upstream and downstream. platelets. The FceRII comprises a single polypeptide chain Similar to FceRI-mediated degranulation, compounds that and does not include the gamma chain homodimer. selectively inhibit upstream FcyRI-mediated degranulation The FcyR family includes three types, designated FcyRI act upstream of the point at which calcium ion mobilization is (also known as CD64), FcyRII (also known as CD32) and induced. In cell-based assays, compounds that selectively FcyIII (also known as CD16). FcyRI is a high affinity receptor inhibit upstream FcyRI-mediated degranulation inhibit (binds IgG1 with an affinity of 10M) found on mast, baso degranulation of cells such as mast or basophil cells that are phil, mononuclear, neutrophil, eosinophil, deudritic and activated or stimulated with an IgG-specificallergen or bind phagocyte cells that anchors nomomeric IgG to the cell Sur 10 ing agent (such as an anti-IgG antibody or fragment) but do face. The FcyRincludes one alpha chain and the gamma chain not appreciably inhibit degranulation of cells that are acti dimer shared by FcCRI and FceRI. vated or stimulated with degranulating agents that bypass the The FcCRII is a low affinity receptor expressed on neutro FcyR signaling pathway, such as, for example the calcium phils, monocytes, eosinophils, platelets and B lymphocytes. ionophores ionomycin and A23 187. The FcyRII includes one alpha chain, and does not include the 15 “Ionoiphore-Induced Degranulation” or “Ionophore-Me gamma chain homodimer discussed above. diated Degranulation” refers to degranulation of a cell. Such The FcyIII is a low affinity (bindes IgGI with an affinity of as a mast or basophil cell, that occurs upon exposure to a 5x10M) expressed on NK, eosinophil, macrophage, neu calcium ionophore Such as, for example, ionomycin or trophil and mast cells. It comprises one alpha chain and the A231.87. gamma homodimer shared by FcCRI, FceRI and FcyRI. “Syk Kinsase' refers to the well-known 72 kDa non-recep Skilled artisans will recognize that the subunit structure tor (cytoplasmic) spleen protein tyrosine kinase expressed in and binding properties of these various Fc receptors, cell B-cells and other hematopoetic cells. Sykkinase includes two types expressing them, are not completely characterized. The consensus Src-homology 2 (SH2) domains in tandem that above discussion merely reflects the current state-of-the-art bind to phosphorylated immunoreceptor tyrosine-based acti regarding these receptors (see, e.g., Immunobiology: The 25 vation motifs (“ITAMs), a “linker” domain and a catalytic Immune System in Health & Disease, 5" Edition, Janeway et domain (for a review of the structure and function of Syk al., Eds, 2001, ISBN 0-8153-3642-x, Figure 9.30 at pp. 371), kinase see Sada et al., 2001, J. Biochem. (Tokyo) 130:177 and is not intended to be limiting with respect to the myriad 186); see also Turneret al., 2000, Immunology Today 21:148 receptor signaling cascades that can be regulated with the 154). Sykkinase has been extensively studied as an effector of compounds described herein. 30 B-cell receptor (BCR) signaling (Turner et al., 2000, supra). “Fc Receptor-Mediated Degranulation' or “Fe Receptor Syk kinase is also critical for tyrosine phosphorylation of Induced Degranulation” refers to degranulation that proceeds multiple proteins which regulate important pathways leading via an Fc receptor signal transduction cascade initiated by from immunoreceptors, such as Ca" mobilization and mito crosslinking of an Fc receptor. gen-activated protein kinase (MAPK) cascades (see, e.g., “IgE-Induced Degranulation” or “FCeRI-Mediated 35 FIG.2) and degranulation. Sykkinase also plays a critical role Degranulation” refers to degranulation that proceeds via the in integrin signaling in neutrophils (see, e.g., Mocsai et al. IgE receptor signal transduction cascade initiated by 2002, Immunity 16:547-558). crosslinking of FceR1-bound IgE. The crosslinking may be As used herein, Syk kinase includes kinases from any induced by an IgE-specificallergen or other multivalent bind species of animal, including but not limited to, homosapiens, ing agent, such as an anti-IgE antibody. Referring to FIG. 2, in 40 simian, bovine, porcine, rodent, etc., recognized as belonging mast and/or basophil cells, the FceRI signaling cascade lead to the Syk family. Specifically included are isoforms, splice ing to degranulation may be broken into two stages: upstream variants, allelic variants, mutants, both naturally occuring and and downstream. The upstream stage includes all of the pro man-made. The amino acid sequences of such Sykkinases are cesses that occur prior to calcium ion mobilization (illustrated well known and available from GENBANK. Specific as “Ca" in FIG. 2; see also FIG. 3). The downstream stage 45 examples of mRNAs encoding different isoforms of human includes calcium ion mobilization and all processes down Syk kinase can be found at GENBANK accession no. stream thereof. Compounds that inhibit FceRI-mediated gi21361552|refNM 003177.21, degranulation may act at any point along the FceRI-mediated gi496899|emb|Z29630.1|HSSYKPTK496899 and signal transduction cascade. Compounds that selectively gil 15030258gb|BC011399.1|BC011399.15030258), which inhibit upstream FceRI-mediated degranulation act to inhibit 50 are incorporated herein by reference. that portion of the FceRI signaling cascade upstream of the Skilled artisans will appreciate that tyrosine kinases point at which calcium ion mobilization is induced. In cell belonging to other families may have active sites or binding based assays, compounds that selectively inhibit upstream pockets that are similar in three-dimensional structure to that FceRI-mediated degranulation inhibit degranulation of cells of Syk. As a consequence of this structural similarity, Such Such as mast or basophil cells that are activated or stimulated 55 kinases, referred to herein as “Syk mimics.” are expected to with an IgE-specific allergen or binding agent (such as an catalyze phosphorylation of Substrates phosphorylated by anti-IgE antibody) but do not appreciably inhibit degranula Syk. Thus, it will be appreciated that Such Syk mimics, signal tion of cells that are activated or stimulated with degranulat transduction cascades in which Such Syk mimics play a role ing agents that bypass the FceRI signaling pathway, such as, and biological responses effected by Such Syk mimics and for example the calcium ionophores ionomycin and A23 187. 60 Syk mimic-dependent signaling cascades may be regulated, “IgG-Induced Degranulation' or “FeyRI-Mediated and in particular inhibited, with the 2.4-pyrimidinediamine Degranulation” refers to degranulation that proceeds via the compounds described herein. FcyRI signal transduction cascade initiated by crosslinking of “Syk-Dependent Signaling Cascade” refers to a signal FcyRI-bound IgG. The crosslinking may be induced by an transduction cascade in which Syk kinase plays a role. Non IgG-specific allergen or another multivalent binding agent, 65 limiting examples of such Syk-dependent signaling cascades Such as an anti-IgG or fragment antibody. Like the FceRI include the FcoRI, FceRI, FcyRI, FcyRIII, BCR and integrin signaling cascade, in mast and basophil cells the FcyRI sig signaling cascades. US 8,178,671 B2 19 20 'Autoimmune Disease' refers to those diseases which are (O)NH-(CH), R, -O-(CHR), C(O)NH commonly associated with the nonanaphylactic hypersensi (CH) R', S (CHR), C(O)NH-(CHR), R, tivity reactions (Type II, Type III and/or Type IV hypersensi NH-(CH), R, NH-(CHR), R, NH tivity reactions) that generally result as a consequence of the (CH), RI, N(CH),R), -NH C(O) NH Subjects own humoral and/or cell-mediated immune (CH.) R. NH C(O)–(CH), CHRR and response to one or more immunogenic Substances of endog NH-(CH2), C(O) NH-(CH2), R: enous and/or exogenous origin. Such autoimmune diseases each R" is independently selected from the group consist are distinguished from diseases associated with the anaphy ing of hydrogen, (C1-C6) alkyl, (C3-C8) cycloalkyl, cyclo lactic (Type I or IgE-mediated) hypersensitivity reactions. hexyl, (C4-C11) cycloalkylalkyl, (C5-C10) aryl, phenyl, (C6 10 C16) arylalkyl, benzyl, 2-6 membered heteroalkyl, 3-8 6.2 The 2,4-Pyrimidinediamine Compounds membered cycloheteroalkyl, morpholinyl, piperazinyl, homopiperazinyl, piperidinyl, 4-11 membered cyclohet The compounds of the invention are generally 2.4-pyrim eroalkylalkyl, 5-10 membered heteroaryland 6-16 membered idinediamine compounds according to structural formula (I): heteroarylalkyl; 15 each R is a suitable group independently selected from the group consisting of =O, —OR". (C1-C3) haloalkyloxy, R6 OCF =S, SR, —NR", =NOR, NRR, halogen, CF, CN, NC, OCN, SCN, NO, NO. —N, R - N - S(O)R, S(O).R., S(O)OR, S(O)NR'R'', 21 N S(O)NRR, OS(O)R, OS(O),R, OS(O)OR, Y L2 N ls L OS(O)NR'R'', C(O)R, C(O)OR, C(O)NR'R'', R4 SN N N1 NR2 C(NH)NR'R'', C(NR)NRR, C(NOH)R", C(NOH)NR'R'', OC(O)R, OC(O)OR, OC(O) NRR, OC(NH)NR'R'', OC(NR)NRR, NHC including salts, hydrates, Solvates and N-oxides thereof, 25 (O), R, NRC(O)I.R., -NHC(O)IOR, NRC(O), wherein: OR, NHC(O)NR'R'', NRC(O)NR'R'', NHC L' and L are each, independently of one another, selected (NH)), NR R and NRC(NR)NR'R'': from the group consisting of a direct bond and a linker; each R is independently R', or, alternatively, each R is R and Rare as described in the following embodiments taken together with the nitrogenatom to which it is bonded to and examples; 30 form a 5 to 8-membered cycloheteroalkyl or heteroaryl which R is selected from the group consisting of R', (C1-C6) may optionally include one or more of the same or different alkyl optionally substituted with one or more of the same or additional heteroatoms and which is optionally substituted different R groups, (C1-C4) alkanyl optionally substituted with one or more of the same or different R or suitable R' with one or more of the same or different R groups, (C2-C4) groups: alkenyl optionally substituted with one or more of the same or 35 each R" is independently R'; different R groups and (C2-C4) alkynyl optionally substi each m is independently an integer from 1 to 3; and tuted with one or more of the same or different R groups; each n is independently an integer from 0 to 3. each Rindependently is selected from the group consist In the compounds of structural formula (I), L' and L’ ing of hydrogen, an electronegative group, —OR', SR', represent, independently of one another, a direct bond or a (C1-C3) haloalkyloxy, (C1-C3) perhaloalkyloxy, —NRR, 40 linker. Thus, as will be appreciated by skilled artisans, the halogen, (C1-C3) haloalkyl, (C1-C3) perhaloalkyl, —CF, substituents R and/or R* may be bonded either directly to —CHCF, CFCF, CN, NC, OCN, SCN, their respective nitrogen atoms or, alternatively, spaced away -NO, NO, N, -S(O)R", -S(O).R', -S(O).OR", from their respective nitrogen atoms by way of a linker. The S(O)NRR, S(O)NRR, OS(O)R’, OS(O).R. identity of the linker is not critical and typical suitable linkers OS(O),OR, OS(O)NRR, OS(O)NRR, C(O) 45 include, but are not limited to, (C1-C6) alkyldiyls, (C1-C6) R, C(O)OR, C(O)NR'R'', C(NH)NR'R'', OC(O) alkanos and (C1-C6) heteroalkyldiyls, each of which may be R, SC(O)R, OC(O)OR, SC(O)OR, OC(O)NR optionally substituted with one or more of the same or differ R, SC(O)NR'R'', OC(NH)NR'R', SC(NH)NRR, ent R groups, where R is as previously defined for structural -NHC(O)I.R., -NHC(O)IOR, -NHC(O)I.NRR formula (I). In a specific embodiment, L' and L are each, and -NHC(NH)NR'R'', (C5-C10) aryl optionally substi 50 independently of one another, selected from the group con tuted with one or more of the same or different R groups, sisting of a direct bond, (C1-C3) alkyldiyl optionally substi phenyl optionally substituted with one or more of the same or tuted with one or more of the same or different R', suitable R' different R groups, (C6-C16) arylalkyl optionally substi or R groups and 1-3 membered heteroalkyldiyl optionally tuted with one or more of the same or different R groups, substituted with one or more of the same or different R', 5-10 membered heteroaryl optionally substituted with one or 55 suitable R or R groups, wherein R is selected from the more of the same or different R groups and 6-16 membered group consisting of (C1-C3) alkyl, —OR". —C(O)OR". (C5 heteroarylalkyl optionally substituted with one or more of the C10) aryl optionally substituted with one or more of the same same or different R groups; or different halogens, phenyl optionally substituted with one R is selected from the group consisting of R. R. R. or more of the same or different halogens, 5-10 membered substituted with one or more of the same or different R or R', 60 heteroaryl optionally substituted with one or more of the —OR" substituted with one or more of the same or different same or different halogens and 6 membered heteroaryl R" or R', B(OR), B(NRR), -(CH), R, optionally substituted with one or more of the same or differ —(CHR), R. -O-(CH) R', S (CH), R. ent halogens; and R and R are as previously defined for - O CHRR, O CR(R) - O (CHR), R, structural formula (I). Specific R groups that may be used to -O-(CH), CHI (CH),R'R'', -S-(CHR), R, 65 substitute L' and L include -OR, C(O)CR, phenyl, —C(O)NH-(CH), R, C(O)NH-(CHR), R, halophenyl and 4-halophenyl, wherein R is as previously O (CH), C(O)NH-(CH2), R', S (CH), C defined for structural formula (I). US 8,178,671 B2 21 22 In another specific embodiment, L' and L are each, inde In particular, Y is O, Z is NH and X is N. Rican behalogen pendently of one another, selected from the group consisting and R is a hydrogen. of methano, ethano and propano, each of which may be In a second embodiment of the compounds of structural optionally monosubstituted with an R group, where R is as formula (I) and (Ia), L', L. R. R. R. R. R. R. R', m, n, previously defined above. 5 R. R. R. R. X,Y and Z areas previously defined, R is In all of the above embodiments, specific R' groups that may be included in R groups are selected from the group consisting of hydrogen, (C1-C6) alkyl, phenyl and benzyl. OR31 In still another specific embodiment, L' and L are each a OR31 direct bond Such that the 2.4-pyrimidinediamine compounds 10 of the invention are compounds according to structural for mula (Ia): OR31

15 R6 wherein each R', independently of the others, is methyl or R 21 (C1-C6) alkyl and R is

R n S N ls N1 R2 H H N including salts, hydrates, Solvates and N-oxides thereof, O Z X wherein R, R, R and R are as previously defined for structural formula (I). Additional specific embodiments of the 25 2.4-pyrimidinediamine compounds of the invention are In particular, Y is O, Z is NH and X is N. R can be halogen described below. and R is a hydrogen. In one particular aspect, Y is O. Zis NH, In a first embodiment of the compounds of structural for X is N and each R is methyl. mula (I) and (Ia), L', L, R,R,R,R,R,R,R, m and in 30 In a third embodiment of the compounds of structural are as previously defined, R is formula (I) and (Ia), L', L. R. R. R. R. R. R. R', m, n, R. R. R. R7, R, X,Y and Zareas previously defined, R’ is OR31 OR31 35 R31 M N N OR31 Y y M N 40 V wherein each R', independently of the others, is methyl or s R31, (C1-C6) alkyl and R is

45 R35 R35 Y. 21

O is 7 X R35 DOA 50

X is selected from the group consisting of N and CH, Y is selected from the group consisting of O, S, SO, SO, SONR, NH, NR and NR7, Z is selected from the group 55 consisting of O, S, SO, SO, SONR, NH, NR and NR7. Each R is, independently of the others, selected from the group consisting of hydrogen and R, or, alternatively, two R bonded to the same carbon atom are taken together to forman oxo (=O), NH or NR group and the other two R. 60 are each, independently of one another, selected from the group consisting of hydrogen and R. Each R is indepen dently selected from the group consisting of hydrogen and (C1-C6) alkyl. Each R is independently selected from the group consisting of hydrogen and a progroup. R is selected 65 from the group consisting of (C1-C6) alkyl and (C5-C14) aryl. US 8,178,671 B2 23 24 andyy is 1-6. In particular. Y is O. Zis NH and X is N. Rican R. R. R. R. X,Y and Zareas previously defined, R is behalogen and R is a hydrogen. a phenyl group trisubstituted with three R groups and R is In a fourth embodiment of the compounds of structural formula (I) and (Ia), L', L. R. R. R. R. R. R. R', m, n, R. R. R. R. X,Y and Z areas previously defined, R is 5

Substitution about the R phenyl ring can be at the 2.3.4. C&O35 C-Cl R Y 2,3,5, 2,3,6, 2,4,5, 2,4,6, 2,5,6,3,4,5, 3,4,6,3,5,6, or 4,5,6 R35 21 positions, with the proviso that the following compounds are 15 not included: R35 Z s N2-(3-Chloro-4-methoxy-5-methylphenyl)-N4-(2,2-dim and R4 is R35 O ethyl-3-oxo-4H-5-pyrid1.4oxazin-6-yl)-5-fluoro-2,4- Y pyrimidinediamine; 21 N2-(3-Chloro-4-hydroxy-5-methylphenyl)-N4-(2,2-dim ethyl-3-oxo-4H-5-pyrid1.4oxazin-6-yl)-5-fluoro-2,4- N O Z X pyrimidinediamine; and N2-(3,5-Dimethyl-4-methoxyphenyl)-N4-(2,2-dimethyl-3- oxo-4H-5-pyrid1.4oxazin-6-yl)-5-fluoro-2,4-pyrim 25 idinediamine. Substitution about the R phenyl ring can be at the 2, 3, 4, 5 or In particular. Y is O, Z is NH and X is N. Rican behalogen 6 positions. In particular, Y is O. Z is NH and X is N. Rican and R is a hydrogen. In certain aspects, each R' indepen be halogen and R is a hydrogen. dently is selected from (C1-C6) alkoxy, (C1-16) alkyl, (C1 In a fifth embodiment of the compounds of structural for C6) perhaloalkyls, halogens, carboxylic acid, carboxylic mula (I) and (Ia), L', L, R,R,R,R,R,R,R, m, n, R, 30 R. R. R. X, Y and Z are as previously defined, R is a esters, carboxamides, Sulfonamides phenyl group disubstituted with two R' groups and R is In certain embodiments, the compounds disclosed in U.S. patent application Ser. Nos. 10/631,029, filed on Jul. 29, 2003 and Ser. No. 10/355,543, filed Jan. 31, 2003, respectively, are 35 not included within the scope of the present application. In a seventh embodiment of the compounds of structural N formula (I) and (Ia), R. R. L. and L are as previously O Z X defined, R is selected from the group consisting of (C1-C6) alkyl optionally substituted with one or more of the same or 40 different R groups, (C3-C8) cycloalkyl optionally substi tuted with one or more of the same or different R groups, Substitution about the R phenyl ring can be at the 2,3,2,4,2, cyclohexyl optionally substituted with one or more of the 5, 2.6, 3.4, 3.5, 3.6, 4.5, 4.6 or 5.6 positions, with the proviso same or different R groups, 3-8 membered cycloheteroalkyl that the following compounds are not included: optionally substituted with one or more of the same or differ N4-(2,2-Dimethyl-3-oxo-4H-5-pyrid 14 oxazin-6-yl)-N2 45 ent R groups, (C5-C15) aryl optionally substituted with one (3-chloro-4-methoxyphenyl)-5-fluoro-2,4-pyrimidinedi or more of the same or different R groups, phenyl optionally amine; substituted with one or more of the same or different R N4-(2,2-Dimethyl-3-oxo-4H-5-pyrid 14 oxazin-6-yl)-N2 groups and 5-15 membered heteroaryl optionally substituted (3,5-dimethoxyphenyl)-5-fluoro-2,4-pyrimidinediamine; with one or more of the same or different R groups, R is N2-(3,4-Dichlorophenyl)-N4-(2,2-dimethyl-3-oxo-4H-5- 50 pyrid1.4oxazin-6-yl)-5-fluoro-2,4-pyrimidinediaamine; N4-(2,2-dimethyl-3-oxo-4H-5-pyrid1.4oxazin-6-yl)-N2 (3-fluoro-4-methoxyphenyl)-5-fluoro-2,4-pyrimidinedi s amine; N N2-(3,5-Dichlorophenyl)-N4-(2,2-dimethyl-3-oxo-4H-5- 55 pyrid1.4oxazin-6-yl)-5-fluoro-2,4-pyrimidinediamine; and N2-(3-Chloro-4-trifluoromethoxyphenyl)-N4-(2,2-dim ethyl-3-oxo-4H-5-pyrid1.4 oxazin-6-yl)-5-fluoro-2,4- pyrimidinediamine. 60 In particular. Y is O, Z is NH and X is N. Rican be halogen Ris (C5-C10)aryloptionally substituted with one or more of and R is a hydrogen. In certain aspects, each R' indepen the same or different R groups or phenyl optionally substi dently is selected from (C1-C6) alkoxy, (C1-16) alkyl, (C1 tuted with one or more of the same or different R groups and C6) perhaloalkyls, halogens, carboxylic acid, carboxylic R is as previously defined. ester, carboxamides, Sulfonamides and imidazoles. 65 In an eighth embodiment of the compounds of structural In a sixth embodiment of the compounds of structural formulae (I) and (Ia), R. R. R. L. and L are as previously formula (I) and (Ia), L', L. R. R. R. R. R. R. R', m, n, defined, R is selected from the group consisting of US 8,178,671 B2 25 26 groups, (C5-C15) aryl optionally substituted with one or OR22 R2 more of the same or different R groups, phenyl optionally substituted with one or more of the same or different R groups and 5-15 membered heteroaryl optionally substituted with one or more of the same or different R groups, R is selected from the group consisting of hydrogen, (C1-C6) alkyl optionally substituted with one or more of the same or different R groups, (C3-C8) cycloalkyl optionally substi R21 tuted with one or more of the same or different R groups, 10 cyclohexyl optionally substituted with one or more of the same or different R groups, 3-8 membered cycloheteroalkyl optionally substituted with one or more of the same or differ ent R groups, (C5-C15) aryl optionally substituted with one R4,2 or more of the same or different R groups, phenyl optionally wherein each R" is independently a halogenatom oran alkyl 15 substituted with one or more of the same or different R optionally substituted with one or more of the same or differ groups and 5-15 membered heteroaryl optionally substituted ent halo groups, Rand Rare each, independently of one with one or more of the same or different R groups, and R' another, a hydrogen atom, methyl or ethyl group optionally is selected from the group consisting of (C1-C6) alkyl option substituted with one or more of the same or different halo ally substituted with one or more of the same or different R groups and R is a (C3-C8) cycloalkyl optionally substituted groups, (C3-C8) cycloalkyl optionally substituted with one or with one or more of the same or different R groups. more of the same or different R groups, cyclohexyl option In a ninth embodiment of the compounds of structural ally substituted with one or more of the same or different R formulae (I) and (Ia), R. R. R. L. and L are as previously groups, 3-8 membered cycloheteroalkyl optionally substi defined, R is selected from the group consisting of (C1-C6) 25 tuted with one or more of the same or different R groups, alkyl optionally substituted with one or more of the same or (C5-C15) aryl optionally substituted with one or more of the different R groups, (C3-C8) cycloalkyl optionally substi same or different R groups, phenyl optionally substituted tuted with one or more of the same or different R groups, with one or more of the same or different R groups and 5-15 cyclohexyl optionally substituted with one or more of the membered heteroaryl optionally substituted with one or more same or different R groups, 3-8 membered cycloheteroalkyl 30 of the same or different R groups. optionally substituted with one or more of the same or differ In an eleventh embodiment of the compounds of structural ent R groups, (C5-C15) aryl optionally substituted with one formulae (I) and (Ia), R. R. R. L. and L are as previously or more of the same or different R groups, phenyl optionally defined, R is substituted with one or more of the same or different R groups and 5-15 membered heteroaryl optionally substituted 35 with one or more of the same or different R groups, R is

R45 40 and R is selected from the group consisting of hydrogen, (C1-C6) alkyl optionally substituted with one or more of the ( K.N (N same or different R groups, (C3-C8) cycloalkyl optionally N N N substituted with one or more of the same or different R R35 s R35 s O R35 45 groups, cyclohexyl optionally Substituted with one or more of the same or different R groups, 3-8 membered cyclohet R is a hydrogen or R; and eroalkyl optionally substituted with one or more of the same R" is a (C3-C8)cycloalkyl optionally substituted with one or different R groups, (C5-C15) aryl optionally substituted or more of the same or different R groups. with one or more of the same or different R groups, phenyl In a tenth embodiment compounds of structural formulae 50 optionally substituted with one or more of the same or differ ent R groups and 5-15 membered heteroaryl optionally sub stituted with one or more of the same or different R groups. F In a twelfth embodiment of the compounds of structural formulae (I) and (Ia), R. R. R. L. and L are as previously R als R2 55 defined, R is NDC N H R-yR35

O 60 R° selected from the group consisting of (C1-C6) alkyl optionally substituted with one or more of the same or differ ent R groups, (C3-C8)cycloalkyl optionally substituted with one or more of the same or different R groups, cyclohexyl O optionally substituted with one or more of the same or differ 65 ent R groups, 3-8 membered cycloheteroalkyl optionally substituted with one or more of the same or different R US 8,178,671 B2 27 28 -continued at the 3 and 4 positions relative to attachment to the N4 amine, particularly with halogen atoms and/or alkoxy groups. In a fifteenth embodiment, the compounds of structural formulae (I) and (Ia), R. R. R. L. and L are as previously N defined, R is a substituted phenyl group, substituted with the same or different R groups and R is O N-R35 A s R35 10 1N R" is selected from the group consisting of hydrogen, (C1-C6) alkyl optionally substituted with one or more of the same or different R groups, (C3-C8) cycloalkyl optionally substi 15 tuted with one or more of the same or different R groups, In one aspect, the R" phenyl group is dior trisubstituted with cyclohexyl optionally substituted with one or more of the the same or different R groups, and in particular, halogen same or different R groups, 3-8 membered cycloheteroalkyl atoms. In particular, R' can be substituted at the 3 and 4 optionally substituted with one or more of the same or differ positions relative to attachment to the N4 amine, particularly ent R groups, (C5-C15) aryl optionally substituted with one with halogen atoms and/or alkoxy groups. or more of the same or different R groups, phenyl optionally In a sixteenth embodiment, the compounds of structural substituted with one or more of the same or different R formulae (I) and (Ia), R. R. R. L. and L are as previously groups and 5-15 membered heteroaryl optionally substituted defined, R is a substituted phenyl group, substituted with the with one or more of the same or different R groups and each same or different R groups and R is R individually is a hydrogen or a suitable R. 25 In a thirteenth embodiment of the compounds of structural formulae (I) and (Ia), R. R. R. L. and L are as previously defined, R is selected from the group consisting of (C1-C6) alkyl optionally substituted with one or more of the same or different R groups, (C3-C8) cycloalkyl optionally substi 30 tuted with one or more of the same or different R groups, cyclohexyl optionally substituted with one or more of the same or different R groups, 3-8 membered cycloheteroalkyl optionally substituted with one or more of the same or differ In one aspect, the R" phenyl group is dior trisubstituted with ent R groups, (C5-C15) aryl optionally substituted with one 35 the same or different R groups, and in particular, halogen or more of the same or different R groups, phenyl optionally atoms. In particular, R' can be substituted at the 3 and 4 substituted with one or more of the same or different R positions relative to attachment to the N4 amine, particularly groups and 5-15 membered heteroaryl optionally substituted with halogen atoms and/or alkoxy groups. with one or more of the same or different R groups, R is In a seventeenth embodiment, the compounds of structural 40 formulae (I) and (Ia), R. R. R. L. and L are as previously defined, R is a substituted phenyl group, substituted with the R3 5 V same or different R groups and R is N

45 1N N 2NN N. R35 and R is a hydrogen or a suitable R. 50 In a fourteenth embodiment, the compounds of structural formulae (I) and (Ia), R. R. R. L. and L are as previously wherein R is an alkylalkoxy group, and in particular is defined, R is a substituted phenyl group, substituted with the same or different R groups and R is 55 N4S, o - O\ / . 60 In one aspect, the R" phenyl group is dior trisubstituted with the same or different R groups, and in particular, halogen (CH2) atoms. In particular, R' can be substituted at the 3 and 4 positions relative to attachment to the N4 amine, particularly wherein"yy”=1 to 6. In one aspect, the R" phenyl group is di 65 with halogen atoms and/or alkoxy groups. or tri substituted with the same or different R groups, and in In a eighteenth embodiment, the compounds of structural particular, halogen atoms. In particular, R' can be substituted formulae (I) and (Ia), R. R. R. L. and L are as previously US 8,178,671 B2 29 30 defined, R is a substituted phenyl group, substituted with the two R's form a gem dialkyl moiety, in particular, a gem same or different R groups and R is dimethyl moiety adjacent to the NH depicted as

N - - N N Me. COH Me 10 wherein R is an alkyl group, and in particular is In a twentieth embodiment, the compounds of structural formulae (I) and (Ia), R. R. R. L. and L are as previously 15 defined, R is

R3s /9 N >{ 2 s In one aspect, the R" phenyl group is dior trisubstituted with the same or different R groups, and in particular, halogen wherein each Rare as defined above, and in particular are atoms. In particular, R' can be substituted at the 3 and 4 25 both halogen atoms, e.g., fluorine, and R is a substituted positions relative to attachment to the N4 amine, particularly phenyl group, substituted with the same or different R with halogen atoms and/or alkoxy groups. groups. In one aspect, the R phenyl group is dior tri Substi In a nineteenth embodiment, the compounds of structural tuted with the same or different R groups, and in particular, formulae (I) and (Ia), R. R. R. L. and L are as previously halogenatoms. In particular, Rican be substituted at the 3 and defined R is 30 5 positions relative to attachment to the N2 amine, particu larly with halogen atoms and/or alkoxy groups.

R35 Y. In a twenty first embodiment, the compounds of structural 21 R35 35 formulae (I) and (Ia), R. R. R. L. and L are as previously -H | defined, R is N Z R35 R35 and R is 21 Y. O, 40 -HS Z r and in particular, is substituted at the 3 or 4 position with the isoxazole. Y is selected from the group consisting of O, S, SO, 45 wherein Y and Z are defined as above and R is SO, SONR, NH and NR7. Z is selected from the group consisting of O, S, SO, SO, SONR, NH and NR7. Each R is, independently of the others, selected from the group consisting of hydrogen and R, or, alternatively, two R. 1s O bonded to the same carbonatom are taken together to forman 50 oxo (=O), NH or NR group and the other two Reach, if C-Cl present, independently of one another, are selected from the group consisting of hydrogen and R. Each R is indepen and in particular is substituted at the 3 or 4 position with the dently selected from the group consisting of hydrogen and isoxazole. In one aspect of the thirty ninth embodiment with (C1-C6) alkyl. Each R7 is independently selected from the 55 regard to R. Y is NH and Z is O. e.g., group consisting of hydrogen and a progroup. R is selected from the group consisting of (C1-C6) alkyl and (C5-C14) aryl. In certain aspects, R is selected from the group consisting of aryl, arylalkyl, heteroaryl, R. R. CRR O C(O)R. 60 CRR O PO(OR), -CH, O PO(OR), OCH CH PO(OR), C(O) CRR N(CH), CRR O C(O) CRR N(CH), C(O)R, C(O)CF, and C(O) NR C(O)R 65 In a twenty second embodiment the compounds of struc In one aspect, Y is oxygen, Z is NH and one or more of R tural formulae (I) and (Ia), R. R. R. L. and L are as is an alkyl group, and in particular, a methyl group. In certain, previously defined, R is US 8,178,671 B2 31 32

O N o1

2 'N1s 5 No s and R2 is CCHNH2 s 10 S\, . 'N1s 2Ny

wherein Y and Rare as defined above. Suitable examples 15 CCHNHRC O CCHOR8 include compounds 368, 381,382,383 and 384. In a twenty sixth embodiment, the compounds of structural formulae (I) and (Ia), R. R. R. L. and L are as previously wherein R and R are as defined above and R is a phenyl defined, R is selected from the group consisting of (C1-C6) group substituted at the 3 or 4 position with alkyl optionally substituted with one or more of the same or different R groups, (C3-C8) cycloalkyl optionally substi tuted with one or more of the same or different R groups, cyclohexyl optionally substituted with one or more of the same or different R groups, 3-8 membered cycloheteroalkyl optionally substituted with one or more of the same or differ --(D 25 ent R groups, (C5-C15) aryl optionally substituted with one or more of the same or different R groups, phenyl optionally substituted with one or more of the same or different R In one aspect —OR, R is a hydrogen atom. groups and 5-15 membered heteroaryl optionally substituted In a twenty third embodiment, the compounds of structural with one or more of the same or different R groups and R is formulae (I) and (Ia), R. R. R. L. and L are as previously 30 defined, R is

35

40 c wherein R is as defined above. Suitable examples include compounds 205 and 206. In a twenty seventh embodiment the compounds of struc and R is a substituted phenyl group, substituted with at least tural formulae (I) and (Ia), R. R. R. L. and L are as two of the same or different R groups as defined above. 45 previously defined, R is Suitable examples include compounds 340,343,349,350 and 351. In a twenty fourth embodiment, the compounds of struc tural formulae (I) and (Ia), R. R. R. L. and L are as previously defined, R is 50

o1 55 and R is a phenyl group substituted with one or more of the same R groups. Suitable examples include compounds 328, 329, 330, 341,553,554, 555,556, 559 and 560. N O In a twenty eighth embodiment, the compounds of struc 8. d R2 is CO DO2 60 tural formulae (I) and (Ia), R. R. R. L. and L are as previously defined, R is selected from the group consisting of (C1-C6) alkyl optionally substituted with one or more of and R is the same or different R groups, (C3-C8) cycloalkyl option ally substituted with one or more of the same or different R In a twenty fifth embodiment, the compounds of structural 5 groups, cyclohexyl optionally Substituted with one or more of formulae (I) and (Ia), R. R. R. L. and Li are as previously the same or different R groups, 3-8 membered cyclohet defined, R is eroalkyl optionally substituted with one or more of the same US 8,178,671 B2 33 or different R groups, (C5-C15) aryl optionally substituted with one or more of the same or different R groups, phenyl optionally substituted with one or more of the same or differ ent R groups and 5-15 membered heteroaryl optionally sub N stituted with one or more of the same or different R groups and R is R2 21 RP s

wherein R is a hydrogen or lower alkyl group, R and Rare 10 each independently lower alkyl groups, or taken together form a cycloalkyl and R is a halogen atom or a lower alkyl group and R is as defined above. Suitable examples include compounds 402,403, 407,408,409 and 410. In a thirty second embodiment, the compounds of struc 15 tural formulae (I) and (Ia), R. R. R. L. and L are as previously defined, R is whereinY is as defined above or is NRandR is as defined above. Suitable examples include compounds 1070, 1071, 1073, 1074, 1075, 1076, 1078, 1080, 1085, 1091 and 1092. 21 e In a twenty ninth embodiment, the compounds of structural N formulae (I) and (Ia), R. R. R. L. and L are as previously N-s/ and R is R O defined, R is N R12 25 O N 21 H N R'' an R'' are each, independently of one another, selected "NN-N 30 from the group consisting of alkyl, alkoxy, halogen, haloalkoxy, aminoalkyl and hydroxyalkyl, In a thirty third embodiment, the compounds of structural wherein R is a substituted phenyl group or an indazole, formulae (I) and (Ia), R. R. R. L. and L are as previously substituted with one or more of the same or different R defined, R is selected from (C1-C6) alkyl optionally substi groups as defined above. Suitable examples include com 35 tuted with one or more of the same or different R groups, pounds 1251, 1252, 1253, 1254 and 1255. (C3-C8) cycloalkyl optionally substituted with one or more of In a thirtieth embodiment, the compounds of structural the same or different R groups, cyclohexyl optionally sub formulae (I) and (Ia), R. R. R. L. and L are as previously stituted with one or more of the same or different R groups, defined, R is 3-8 membered cycloheteroalkyl optionally substituted with 40 one or more of the same or different R groups, (C5-C15) aryl optionally substituted with one or more of the same or differ ent R groups, phenyloptionally substituted with one or more R3 O of the same or different R groups and 5-15 membered het R35 eroaryl optionally substituted with one or more of the same or O N 2 45 different R groups,

s s R46 OR22 wherein each Rindependently is as described above and R' 50

R48 s OR2, C-Cl1s O R21 OR21 Suitable examples include compounds 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 60 R22 OR23 233,234, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, R23, 246, 247, 1281, 1283, 1283, 1284, 1285, 1287, 1288, 1289, n-no 1290 and 1291. N In a thirty first embodiment, the compounds of structural 65 formulae (I) and (Ia), R. R. R. L. and L are as previously C defined, R is US 8,178,671 B2 35 36 -continued -continued

10 O O V/ S

15

R is O DOA s R2O R28

R28 R28

25

30

35

40

O N H , or }x:

45 R. R. R. R. R. R. R, m and n areas described above: each R", R” and R are each, independently of one another, as described above and in particular, an alkyl group; each R individually is a halogen or alkoxy; R’ is a (C1-C6) alkyl or (C3-C9) cycloalkyl: 50 R" is an alkyl group or a halogen; X is selected from the group consisting of N and CH: Y, Z, R. R. R7 and Rare as described above; each R, R-7 and R' independently is selected from the group consisting of a hydrogen, alkyl, alkoxy, hydroxyl, halo 55 gen, isoxazole, piperazino, N-alkyl piperazine, morpholino and CH-NHC(O)CHO , with the proviso that R, R-7 and Rare all not hydrogen and when one of R. R7 or R is isoxazole, piperazino, N-alkyl piperazine, morpholino or CHNHC(O)CHO. , then the remaining R, R-7 or Rare 60 hydrogen; R" is an alkyl group or -(CH.) OH: q is an integer from 1 to 6: R is an alkyl group or a substituted alkyl group p is 1, 2 or 3; and 65 X=1-8. In a thirty fourth embodiment of the compounds of struc tural formulae (I) and (Ia), R. R. R. L. and L are as previ US 8,178,671 B2 37 38 ously described for their respective structures (I) and (Ia), different R groups, (C3-C8) cycloalkyl optionally substi with the proviso that R is not 3,4,5-trimethoxyphenyl, 3.4. tuted with one or more of the same or different R groups, 5-tri (C1-C6) alkoxyphenyl or cyclohexyl optionally substituted with one or more of the same or different R groups, 3-8 membered cycloheteroalkyl optionally substituted with one or more of the same or differ ent R groups, (C5-C15) aryl optionally substituted with one or more of the same or different R groups, phenyl optionally substituted with one or more of the same or different R OR22 groups and 5-15 membered heteroaryl optionally substituted 10 with one or more of the same or different R groups. R is OR 23 where R', R’ and Rare as defined for R', Rand R. V / respectively of U.S. Pat. No. 6,235,746, the disclosure of 15 which is incorporated by reference. In a specific embodiment of this first embodiment, R is hydrogen, halo, straight-chain or branched (C1-C6) alkyl optionally substituted with one or more of the same or different R groups, hydroxyl, (C1-C6) DCO/ alkoxy optionally substituted with one or more of the same or different phenyl or R groups, thiol ( SH), (C1-C6) alky lthio optionally substituted with one or more of the same or R. RandR are described as above. In certain embodiments, different phenyl or R groups, amino ( NH), NHR' or R is a fluorine atom and R is a hydrogen atom. In certain -NR'R'': R* and R are each, independently of one embodiments, R is a di or tri-substituted phenyl group. another, a (C1-C6) straight-chain or branched alkyl option 25 In a thirty seventh embodiment, the invention pertains to ally substituted with one or more of the same or different R 2.4-pyrimidinediamine compounds according to structures I groups; R is selected from the group consisting of halo, and I(a) wherein R is hydroxyl (C1-C6) alkoxy, thiol, (C1-C6) alkylthio. (C1-C6) alkylamino and (C1-C6) dialkylamino; and each R is inde pendently a (C1-C6) alkyl optionally substituted with one or 30 R46 OR22 more of the same or different phenyl or R groups or a —C(O)R’7, where R7 is a (C1-C6) alkyl optionally substi tuted with one or more of the same or different phenyl or R R47 groups. In another specific embodiment, R is methoxy optionally 35 substituted with one or more of the same or different halo R48 s OR2, groups and/or R’ and R are each, independently of one R21 OR21 another, a methyl or ethyl optionally substituted with one or more of the same or different halo groups. O OR2, R is In a thirty fifth embodiment, the compounds of structural 40 formulae (I) and (Ia), R. R. R. L. and L are as previously defined: R22 OR23 O O R is \/ 45 R35, R4 is NO 50

R3 O and R. R. R. and R. R. R7 and R are as defined above, each R', independently of one another, is an alkyl group. In certain embodiments, Risa fluorine atom and Ris 55 a hydrogen atom. In a thirty eighth embodiment, the present invention relates to 2.4-pyrimidinediamine compounds according to structures I and I(a) wherein R is R. R. R. Rand Xareas defined above. In certain embodi ments, x is 2 through 4. In otherembodiments, R is a methyl 60 group. In still additional embodiments, R is chlorine, R4,23 methyl or trifluoromethyl. In still other embodiments, R is fluorine and R is hydrogen. In a thirty sixth embodiment the 2.4-pyrimidinediamine includes those compounds according to structures I and I(a) 65 wherein R is selected from the group consisting of (C1-C6) alkyl optionally substituted with one or more of the same or US 8,178,671 B2 40 -continued -continued R2O R2S Meo, O

R28 R28 O N R is, s s PC/ O N

10 2 O N N H

15

H O PC/ s O R33 Y N R35 H 2 R35 Z X R35

25 O N R. R. R. R', each R, R2, R,R,R,R, m and n, X,Y,

s O Z, each Reach R, each R7 and R are as described R33 PC/Y above. N R35 In certain embodiments, R’ is a t-butyl group. In other 30 embodiments, R is a methyl group. In certain embodiments, R35 Z 4. each R is a chlorine. In still another embodiment, R is a R35 methyl group and at least one of R is a chlorine. In a fortieth embodiment, the invention pertains to 2,4- R, R, R, R2, R23, R28, R3s, R36, R37, R38, Y. Z, R, R, 35 pyrimidinediamine compounds according to structures I and R. R", mand n areas described above, and X is selected from I(a) wherein R is the group consisting of N and CH. In a particular embodi ment, R is a methoxy. In another embodiment, R is methyl. In particular embodiments, R is a methyl group. In other embodiments, each R is chlorine. In still additional 40 embodiments, R is a methyl group and at least one R is a chlorine. In another embodiment, R is a methoxy. In a thirty ninth embodiment, the present invention pro vides pyrimidinediamine compounds according to structures 45 I and 1(a) wherein R is R2O R28

R28 R28 50 R is s s N 1N1\ l R29, M H R33 Y 7 N 55 R35 2 R21 O R28 R35 Z X

R28 R28 60 R is, s s O R. R. R. R', each R. R. R. R. R, m, n, p, X,Y,Z, each R, each R, each R7 and Rare as described above. In particular embodiments, R is a methyl group. In other O N 65 embodiments, each R is a chlorine. In still other embodi H ments, R is a methyl group and at least one of R is a chlorine. In still another aspect, p is 1 or 2. US 8,178,671 B2 41 42 In a forty first embodiment, the invention relates to 2,4- and secondary), hydroxyls, Sulfanyls (thiols), carboxyls, etc. pyrimidinediamine compounds according to structures I and Myriad progroups Suitable for masking such functional I(a) wherein R is groups to yield promoieties that are cleavable under the desired conditions of use are known in the art. All of these progroups, alone or in combinations, may be included in the prodrugs of the invention. In one illustrative embodiment, the prodrugs of the inven tion are compounds according to structural formula (I) in which R and R may be, in addition to their previously 10 defined alternatives, a progroup. Those of skill in the art will appreciate that many of the compounds and prodrugs of the invention, as well as the various compound species specifically described and/or illus trated herein, may exhibit the phenomena of tautomerism, 15 conformational isomerism, geometric isomerism and/or opti cal isomerism. For example, the compounds and prodrugs of the invention may include one or more chiral centers and/or double bonds and as a consequence may exist as Stereoiso R is O mers, such as double-bond isomers (i.e., geometric isomers), enantiomers and diasteromers and mixtures thereof. Such as racemic mixtures. As another example, the compounds and prodrugs of the invention may exist in several tautomeric forms, including the enol form, the keto form and mixtures thereof. As the various compound names, formulae and com 25 pound drawings within the specification and claims can rep resent only one of the possible tautomeric, conformational isomeric, optical isomeric or geometric isomeric forms, it should be understood that the invention encompasses any R,R,R,R, each R,R,R,R,R, m, n, q, X,Y,Z, R., tautomeric, conformational isomeric, optical isomeric and/or R, R-7, R, R, and R° are as described above. geometric isomeric forms of the compounds or prodrugs hav ing one or more of the utilities described herein, as well as In certain aspects, R is —CHCH OH or methyl. In mixtures of these various different isomeric forms. In cases of another aspect, R’ is trifluoromethyl. In still another aspect, limited rotation around the 2.4-pyrimidinediamine core at least one R is a chlorine. In yet another aspect, R' is a structure, atropisomers are also possible and are also specifi methyl and at least one R is a chlorine. cally included in the compounds of the invention. In a forty second embodiment, applicable to the first Moreover, skilled artisans will appreciate that when lists of through forty first embodiments, Rof the pyrimidine ring is alternative substituents include members which, owing to a halogen atom, such as fluorine, and R of the pyrimidine Valency requirements or other reasons, cannot be used to ring is a hydrogen atom. Substitute a particular group, the list is intended to be read in In a forty third embodiment, L' and L are covalent bonds 40 context to include those members of the list that are suitable for the above-identified embodiments. for Substituting the particular group. For example, skilled Also specifically described are combinations of the above artisans will appreciate that while all of the listed alternatives first through forty third embodiments. for R' can be used to substitute an alkyl group, certain of the Those of skill in the art will appreciate that the 2.4-pyrim alternatives, such as =O, cannot be used to Substitute a idinediamine compounds described herein may include func 45 phenyl group. It is to be understood that only possible com tional groups that can be masked with progroups to create binations of Substituent-group pairs are intended. prodrugs. Such prodrugs are usually, but need not be, phar The compounds and/or prodrugs of the invention may be macologically inactive until converted into their active drug identified by either their chemical structure or their chemical form. Indeed, many of the active 2.4-pyrimidinediamine name. When the chemical structure and the chemical name compounds described in TABLE 1, include promoieties that 50 conflict, the chemical structure is determinative of the iden are hydrolyzable or otherwise cleavable under conditions of tity of the specific compound. use. For example, ester groups commonly undergo acid-cata Depending upon the nature of the various Substituents, the lyzed hydrolysis to yield the parent carboxylic acid when 2.4-pyrimidinediamine compounds and prodrugs of the exposed to the acidic conditions of the stomach, or base invention may be in the form of salts. Such salts include salts catalyzed hydrolysis when exposed to the basic conditions of 55 Suitable for pharmaceutical uses (“pharmaceutically-accept the intestine or blood. Thus, when administered to a subject able salts'), salts suitable for veterinary uses, etc. Such salts orally, 2.4-pyrimidinediamines that include ester moieties may be derived from acids or bases, as is well-known in the may be considered prodrugs of their corresponding carboxy art. lic acid, regardless of whether the ester form is pharmaco In one embodiment, the salt is a pharmaceutically accept logically active. Referring to TABLE 1, numerous ester-con 60 able salt. Generally, pharmaceutically acceptable salts are taining 2.4-pyrimidinediamines of the invention are active in those salts that retain substantially one or more of the desired their ester, “prodrug form. pharmacological activities of the parent compound and which In the prodrugs of the invention, any available functional are suitable for administration to humans. Pharmaceutically moiety may be masked with a progroup to yield a prodrug. acceptable salts include acid addition salts formed with inor Functional groups within the 2.4-pyrimidinediamine com 65 ganic acids or organic acids. Inorganic acids Suitable for pounds that may be masked with progroups for inclusion in a forming pharmaceutically acceptable acid addition salts promoiety include, but are not limited to, amines (primary include, by way of example and not limitation, hydrohalide US 8,178,671 B2 43 44 acids (e.g., hydrochloric acid, hydrobromic acid, hydriodic, 6.3 Methods of Synthesis etc.), Sulfuric acid, nitric acid, phosphoric acid, and the like. Organic acids suitable for forming pharmaceutically accept The compounds and prodrugs of the invention may be able acid addition salts include, by way of example and not synthesized via a variety of different synthetic routes using limitation, acetic acid, trifluoroacetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, commercially available starting materials and/or starting oxalic acid, pyruvic acid, lactic acid, malonic acid. Succinic materials prepared by conventional synthetic methods. Suit acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric able exemplary methods that may be routinely adapted to acid, palmitic acid, benzoic acid, 3-(4-hydroxybenzoyl) ben synthesize the 2.4-pyrimidinediamine compounds and pro Zoic acid, cinnamic acid, mandelic acid, alkylsulfonic acids 10 drugs of the invention are found in U.S. Pat. No. 5,958,935, (e.g., methanesulfonic acid, ethanesulfonic acid, 1.2-ethane U.S. patent application Ser. No. 10/355,543, filed Jan. 31, disulfonic acid, 2-hydroxyethanesulfonic acid, etc.), arylsul 2003 (US Publication US20040029902-A1), WO 03/063794, fonic acids (e.g., benzenesulfonic acid, 4-chlorobenzene published Aug. 1, 2003, U.S. patent application Ser. No. Sulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic 10/631,029, filed Jul. 29, 2003 and WO 2004/014382, pub acid, cycloalkylsulfonic acids (e.g., camphorsulfonic acid), 15 lished Feb. 19, 2004, the disclosures of which are incorpo 4-methylbicyclo[2.2.2-oct-2-ene-1-carboxylic acid, gluco rated herein by reference. All of the compounds of structural heptonic acid, 3-phenylpropionic acid, trimethylacetic acid, formulae (I), (Ia) and (II) may be prepared by routine adap tertiary butylacetic acid, lauryl Sulfuric acid, gluconic acid, tation of these methods. glutamic acid, hydroxynaphthoic acid, salicylic acid, Stearic acid, muconic acid, and the like. 2O A variety of exemplary synthetic routes that can be used to Pharmaceutically acceptable salts also include Salts synthesize the 2.4-pyrimidinediamine compounds of the formed when an acidic proton present in the parent compound invention are described in Schemes (I)-(XI), below. In is either replaced by a metalion (e.g., an alkali metalion, an Schemes (I)-CXI), like-numbered compounds have similar alkaline earth metal ion or an aluminum ion), an ammonium structures. These methods may be routinely adapted to Syn ion or coordinates with an organic base (e.g., ethanolamine, 25 diethanolamine, triethanolamine, N-methylglucamine, mor thesize the prodrugs according to structural formula (II). pholine, piperidine, dimethylamine, diethylamine, etc.). The 2.4-pyrimidinediamine compounds and of the inven In one exemplary embodiment, the compounds can be tion, as well as the salts thereof, may also be in the form of synthesized from substituted or unsubstituted uracils or hydrates, Solvates and N-oxides, as are well-known in the art. thiouracils as illustrated in Scheme (I), below:

R 6 1 NH POX (other halogenating agents) 21 n13 2ny H 2

C4 halide is more 10 reactive towards (XCESS nucleophiles US 8,178,671 B2 45 46 -continued R6 R 6 1 R41'NNL2 is 2Y-N1"N,L2 H 3 H 14

In Scheme (I), R. R. R. R. L. and L are as previously rich #22.458-8; CAS Registry 1820-81-1); 5-cyanouracil defined for structural formula (I), X is a halogen (e.g., F. Cl, (Chem. Sources Int’l 2000; CAS Registry 4425-56-3); Br or I) and Y and Y are each, independently of one another, 5-ethyluracil (Aldrich #23,044-8; CAS Registry 42 12-49-1); selected from the group consisting of 0 and S. Referring to 15 5-ethenyluracil (CAS Registry 37107-81-6); 5-fluorouracil Scheme (I), uracilor thiouracil2 is dihalogenated at the 2- and (Aldrich #85,847-1; CAS Registry 51-21-8); 5-iodouracil 4-positions using standard halogenating agent POX (or other (Aldrich #85,785-8; CAS Registry 696-07-1);5-methyluracil standard halogenating agent) under standard conditions to (thymine; Aldrich #13, 199-7: CAS Registry 65-71-4): 5-ni yield 2.4-bishalopyrimidine 4. Depending upon the R sub trouracil (Aldrich #85,276-7: CAS Registry 611-08-5): stituent, in pyrimidine 4, the halide at the C4 position is more uracil-5-sulfamic acid (Chem. Sources Int’l 2000; CAS Reg reactive towards nucleophiles than the halide at the C2 posi istry 5435-16-5); 5-(trifluoromethyl)-uracil (Aldrich tion. This differential reactivity can be exploited to synthesize #22.327-1; CAS Registry 54-20-6); 5-(2.2.2-trifluoroethyl)- 2.4-pyrimidinediamines according structural formula (I) by uracil (CAS Registry 155143-31-6); 5-(pentafluoroethyl)- first reacting 2.4-bishalopyrimidine 4 with one equivalent of 25 uracil (CAS Registry 60007-38-3); 6-aminouracil (Aldrich amine 10, yielding 4N-Substituted-2-halo-4-pyrimidineam #A5060-6: CAS Registry 873-83-6) uracil-6-carboxylic acid ine 8, followed by amine 6 to yield a 2.4-pyrimidinediamine (orotic acid; Aldrich #0-840-2; CAS Registry 50887-69-9); according structural formula (I). 2N,4N-bis(substituted)-2,4- 6-methyluracil (Aldrich #D11,520-7: CAS Registry 626-48 pyrimidinediamines 12 and 14 can be obtained by reacting 2); uracil-5-amino-6-carboxylic acid (5-aminoorotic acid; 2.4-bishalopyrimidine 4 with excess 6 or 10, respectively. 30 Aldrich #19,121-3; CAS Registry #7164-43-4); 6-amino-5- In most situations, the C4 halide is more reactive towards nitrosouracil (6-amino-2,4-dihydroxy-5-nitrosopyrimidine; nucleophiles, as illustrated in the Scheme. However, as will Aldrich #27,689-8; CAS Registry 5442-24-0); uracil-5- be recognized by skilled artisans, the identity of the R sub fluoro-6-carboxylic acid (5-fluoroorotic acid; Aldrich #42, stituent may alter this reactivity. For example, when R is 35 513-3; CAS Registry 00000-00-0); and uracil-5-nitro-6-car trifluoromethyl, a 50:50 mixture of 4N-substituted-4-pyrim boxylic acid (5-nitroorotic acid; Aldrich #18,528-0; CAS idineamine 8 and the corresponding 2N-Substituted-2-pyrim Registry 600779-49-9). Additional 5-, 6- and 5,6-substituted idineamine is obtained. Regardless of the identity of the R uracils and/or thiouracils are available from General Interme diates of Canada, Inc., Edmonton, Alberta, CA. (www.gen Substituent, the regioselectivity of the reaction can be con 40 trolled by adjusting the solvent and other synthetic conditions eralintermediates.com) and/or Interchim, France (www.in (such as temperature), as is well-known in the art. terchim.com), or may be prepared using standard techniques. Myriad textbook references teaching suitable synthetic meth The reactions depicted in Scheme (I) may proceed more ods are provided infra. quickly when the reaction mixtures are heated via microwave. 45 Amines 6 and 10 may be purchased from commercial When heating in this fashion, the following conditions may Sources or, alternatively, may be synthesized utilizing stan be used: heat to 175° C. in ethanol for 5-20 min. in a Smith dard techniques. For example, Suitable amines may be Syn Reactor (Personal Chemistry) in a sealed tube (at 20 bar thesized from nitro precursors using standard chemistry. Spe pressure). cific exemplary reactions are provided in the Examples The uracil or thiouracil 2 starting materials may be pur 50 section. See also Vogel, 1989, Practical Organic Chemistry, chased from commercial sources or prepared using standard Addison Wesley Longman, Ltd. and John Wiley & Sons, Inc. techniques of organic chemistry. Commercially available Skilled artisans will recognize that in Some instances, uracils and thiouracils that can be used as starting materials in amines 6 and 10 and/or substituents Rand/or Ron uracil or Scheme (I) include, by way of example and not limitation, thiouracil 2 may include functional groups that require pro uracil (Aldrich #13,078-8; CAS Registry 66-22-8): 2-thio 55 tection during synthesis. The exact identity of any protecting uracil (Aldrich #11,558-4; CAS Registry 141-90-2); 2.4- group(s) used will depend upon the identity of the functional dithiouracil (Aldrich #15,846-1; CAS Registry 2001-93-6): group being protected, and will be apparent to these of skill in 5-acetouracil (Chem. Sources Int’l 2000; CAS Registry the art. Guidance for selecting appropriate protecting groups, 6214-65-9); 5-azidouracil; 5-aminouracil (Aldrich #85,528 60 as well as synthetic strategies for their attachment and 6: CAS Registry 932-52-5);5-bromouracil (Aldrich #85,247 removal, may be found, for example, in Greene & Wuts, 3: CAS Registry 51-20-7); 5-(trans-2-bromovinyl)-uracil Protective Groups in Organic Synthesis, 3d Edition, John (Aldrich #45,744-2; CAS Registry 69304-49-0): 5-(trans-2- Wiley & Sons, Inc., New York (1999) and the references cited chlorovinyl)-uracil (CAS Registry 81751-48-2): 5-(trans-2- therein (hereinafter “Greene & Wuts”). carboxyvinyl)-uracil; uracil-5-carboxylic acid (2,4-dihy 65 A specific embodiment of Scheme (D) utilizing 5-fluorou droxypyrimidine-5-carboxylic acid hydrate; Aldrich racil (Aldrich #32.937-1) as a starting material is illustrated in #27,770-3; CAS Registry 23945-44-0): 5-chlorouracil (Ald Scheme (Ia), below: US 8,178,671 B2

Scheme (Ia) F r6 F r6 41Y L2N1 NSN1 ls Ne. - 1 equiv6 -- 41Y L2n1n N 1 NN1 Lin H 3 H 3 H 7 9

10 1 equiv

F 6 F 6 F 6 S1 NH, Pool, 1YN 6 1YN 3 Sa (XCESS - L. N -L o21 n 4s12 no c14 N12ls No 21 in 14N1 NN1 in H 3 H 3 H 3 5 11

10 (XCESS

F 6

L2 N L2 41Y N1).DC N1y 1 ns H 3 H 13

In Scheme (Ia), R. R. L. and L areas previously defined lent of amine 10 (to yield 2-chloro-N4-substituted-5-fluoro for Scheme (I). According to Scheme (Ia), 5-fluorouracil3 is 4-pyrimidineamine 7) followed by one or more equivalents of halogenated with POCl to yield 2,4-dichloro-5-fluoropyri amine 6. midine 5, which is then reacted with excess amine 6 or 10 to 35 yield N2.N4-bis substituted 5-fluoro-2,4-pyrimidinediamine In another exemplary embodiment, the 2.4-pyrimidinedi 11 or 13, respectively. Alternatively, non-bis 2N.4N-disubsti amine compounds of the invention may be synthesized from tuted-5-fluoro-2,4-pyrimidinediamine 9 may be obtained by substituted or unsubstituted cytosines as illustrated in reacting 2,4-dichloro-5-fluoropyrimidine 5 with one equiva Schemes (IIa) and (IIb), below:

Scheme (IIa R6 R6 R6 R 6 R 6 R 6 5 21 NN acylation, 5 21 NN 5 a NN 3 4. silylation, etc. 4. (other halogenatingPOX agents) HN1 N 2no PGHN S. 2no PGHN is 2 Yx 3 3 2O 22 24

R6 R6 R6 R 6 R 6 R 6 a NN a NN a NN 5 10 5 deprotect 5 41Y L2NN1SN Sa 1YN1 L N2 N1N1YN1"N,Sa L PGN14YN1YN1N L NR2 H 3 H 3 H 3 H (I) 28 26 US 8,178,671 B2

-continued Scheme (IIb.

R6 R6 R6 R 6 R 6 R 6 21 21 NN 21 NN 5 1. -e-acid- 10or base L2 5 Sa -e-(other halogenatingPOX agents) L2 5 lsN HN is 2 no catalyzed 41"N, 1N1 So R41"YN in 2 Nx 3 3 H 3 2O 23 25

L2 PR4 1 n NH2 21 R6 R6 R6 R 6 R 6 R 6 1 NH POX 1 N 1) 6 1 L2 (other L2 l 2) deprotect L2 l L PGR41 NN is 2YO halogenating PGR41 NN S. 2 Yx R41 NN is 2 N1 n R2 H 3 agents) H 3 H 3 H 27 29 (I)

25 In Schemes (IIa) and (IIb), R,R,R,R,L,L and X are as previously defined for Scheme (I) and PG represents a Scheme (III protecting group. Referring to Scheme (IIa), the C4 exocyclic amine of cytosine 20 is first protected with a suitable protect R6 R6 R 6 R 6 ing group PG to yield N4-protected cytosine 22. For specific 5 21 g 5 21 guidance regarding protecting groups useful in this context, L see Vorbriggen and Ruh-Pohlenz, 2001, Handbook of HO14 SaYN12 l NH, Z1 N R2 1SN1,NN1"SR2ls L Nucleoside Synthesis, John Wiley & Sons, NY. pp. 1-631 3 31 3 H (“Vorbriggen'). Protected cytosine 22 is halogenated at the 35 30 32 C2 position using a standard halogenation reagent understan dard conditions to yield 2-chloro-4N-protected-4-pyrim idineamine 24. Reaction with amine 6 followed by deprotec pox. tion of the C4 exocyclic amine and reaction with amine 10 R6 R6 yields a 2.4-pyrimidinediamine according to structural for 40 6 6 mula (I). R R Alternatively, referring to Scheme (IIb), cytosine 20 may Y'aL2 Sa l L - i.l L be reacted with amine 10 or protected amine 21 to yield R4 N-N-N-R x1SN1,N1's N4-substituted cytosine 23 or 27, respectively. These substi 3 H 3 H tuted cytosines may then be halogenated as previously 45 (I) 34 described, deprotected (in the case of N4-substituted cytosine 27) and reacted with amine 6 to yield a 2.4-pyrimidinedi In Scheme (III), R. R. R. R. L', Land X are as previ amine according to structural formula (I). ously defined for Scheme (I) and Z is a leaving group as Commercially-available cytosines that may be used as 50 discussed in more detail in connection with Scheme IV, infra. starting materials in Schemes (IIa) and (IIb) include, but are Referring to Scheme (III), 2-amino-4-pyrimidinol 30 is not limited to, cytosine (Aldrich #14.201-8; CAS Registry reacted with amine 6 (or optionally protected amine 21) to 71-30-7); N-acetylcytosine (Aldrich #37,791-0; CAS Reg yield N2-substituted-4-pyrimidinol 32, which is then haloge istry 14631-20-0); 5-fluorocytosine (Aldrich #27,159-4: nated as previously described to yield N2-substituted-4-halo CAS Registry 2022-85-7); and 5-(trifluoromethyl)-cytosine. 55 2-pyrimidineamine 34. Optional deprotection (for example if protected amine 21 was used in the first step) followed by Other Suitable cytosines useful as starting materials in reaction with amine 10 affords a 2.4-pyrimidinediamine Schemes (IIa) are available from General Intermediates of according to structural formula (I). Alternatively, pyrimidinol Canada, Inc., Edmonton, Alberta, CA (www.generalinterme 30 can be reacted with acylating agent 31. diates.com) and/or Interchim, France (www.interchim.com), 60 Suitable commercially-available 2-amino-4-pyrimidinols or may be prepared using standard techniques. Myriad text 30 that can be used as starting materials in Scheme (III) book references teaching Suitable synthetic methods are pro include, but are not limited to, 2-amino-6-chloro-4-pyrimidi vided infra. nol hydrate (Aldrich #A4702-8; CAS Registry 00000-00-0) In still another exemplary embodiment, the 2.4-pyrim and 2-amino-6-hydroxy-4-pyrimidinol (Aldrich #A5040-1: idinediamine compounds of the invention may be synthesized 65 CAS Registry 56-09-7). Other 2-amino-4-pyrimidinols 30 from Substituted or unsubstituted 2-amino-4-pyrimidinols as useful as starting materials in Scheme (III) are available from illustrated in Scheme (III), below: General Intermediates of Canada, Inc., Edmonton, Alberta, US 8,178,671 B2 51 CA (www.generalintermediates.com) and/or Interchim, -continued France (www.interchim.com), or may be prepared using stan R6 dard techniques. Myriad textbook references teaching Suit R 6 able synthetic methods are provided infra. 5 21 N1 Alternatively, the 2.4-pyrimidinediamine compounds of 5 the invention may be prepared from substituted or unsubsti R4 - IS 1N1N NN1 LSin tuted 4-amino-2-pyrimidinols as illustrated in Scheme (IV), H 3 H below:

10 In Scheme (IV), R. R. R. R. L. and L areas previously Scheme (IV) defined for Scheme (I) and Z represents a leaving group. R6 Referring to Scheme (IV), the C2-hydroxyl of 4-amino-2- 6 pyrimidinol 40 is more reactive towards nucleophiles than the R 21 N1 6 15 C4-amino such that reaction with amine 6 yields N2-substi 5 tuted-2,4-pyrimidinediamine 42. Subsequent reaction with --- compound 44, which includes a good leaving group Z, or HN N N lsOH amine 10 yields a 2.4-pyrimidinediamine according to struc 3 tural formula (I). Compound 44 may include virtually any 40 leaving group that can be displaced by the C4-amino of N2-substituted-2,4-pyrimidinediamine 42. Suitable leaving groups Z include, but are not limited to, halogens, methane sulfonyloxy (mesyloxy: “OMs), trifluoromethanesulfony loxy ("OTf) and p-toluenesulfonyloxy (tosyloxy: “OTs), benzene sulfonyloxy (“besylate”) and metanitrobenzene sul R6 25 fonyloxy (“nosylate'). Other suitable leaving groups will be L2 apparent to those of skill in the art. R 21 6 R41 NZ Substituted 4-amino-2-pyrimidinol starting materials may 5 44 be obtained commercially or synthesized using standard tech He N L or 10 niques. Myriad textbook references teaching Suitable syn N1,N1YN1 N. 30 thetic methods are provided infra. 3 H In still another exemplary embodiment, the 2.4-pyrim 42 idinediamine compounds of the invention can be prepared from 2-chloro-4-aminopyrimidines or 2-amino-4-chloropy rimidines as illustrated in Scheme (V), below:

Scheme (V) R6 R6 R 6 R 6 1 h 10 5 21 N1 --- N 4 R4 Y L& N N N ls NH2 c114 YN123 NH, 3 50 52 Nors R6 R 6 5 21 N1 - IS N l - In R4 N N3 N R2 (I) s/ R6 R6 R 6 R 6 1N 44 5 21 N1 N 2 HN N C -- R4 Y Li N N N lsC H 3 56 US 8,178,671 B2 53 54 In Scheme (V), R. R. R. R. L., Land X areas defined for Scheme (I) and Z is as defined for Scheme (IV). Referring Scheme (Va) to Scheme (V), 2-amino-4-chloropyrimidine 50 is reacted R6 with amino 10 to yield 4N-substituted-2-pyrimidineamine 52 O 6 which, following reaction with compound 31 or amine 6, 5 R6 NH R 21 NN yields a 2.4-pyrimidinediamine according to structural for- R5 -- ls He- 5 h mula (I). Alternatively, 2-chloro-4-amino-pyrimidine 54 may H NH NH2 4S ls be reacted with compound 44 followed by amine 6 to yield a O N NH2 compound according to structural formula (I). 10 53 51 |colt A variety of pyrimidines 50 and 54 suitable for use as R6 starting materials in Scheme (V) are commercially available, 15 R6 R 6 including by way of example and not limitation, 2-amino-4, R 6 5 21 NN 6-dichloropyrimidine (Aldrich #A4860-1; CAS Registry 1YN POCl. ls 56-05-3): 2-amino-4-chloro-6-methoxy-pyrimidine (Aldrich ls DMF 4 s 2 YNH #51,864-6: CAS Registry 5734-64-5): 2-amino-4-chloro-6- c-1SN1 ns 2 methylpyrimidine (Aldrich #12.288-2; CAS Registry 5600- ? 3 O 21-5); and 2-amino-4-chloro-6-methylthiopyrimidine (Ald- 50 55 rich #A4600-5: CAS Registry 1005-38-5). Additional In Scheme (Va), R and Rare as previously defined for pyrimidine starting materials are available from General structural formula (I). In Scheme (Va), dicarbonyl 53 is Intermediates of Canada, Inc., Edmonton, Alberta, CA (ww- reacted with guanidine to yield 2-pyrimidineamine 51. Reac w.generalintermediates.com) and/or Interchim, France (ww- ? tion with peracids like m-chloroperbenzoic acid, trifluorop w.interchim.com), or may be prepared using standard tech- eracetic acidorurea hydrogen peroxide complex yields N-ox niques. Myriad textbook references teaching Suitable ide 55, which is then halogenated to give 4-chloro-2- synthetic methods are provided infra. pyrimidineamine 50. The corresponding 4-halo-2- pyrimidineamines may be obtained by using Suitable 30 halogenation reagents. In yet another exemplary embodiment, the 2.4-pyrim idinediamine compounds of the invention can be prepared Alternatively, 4-chloro-2-pyrimidineamines 50 may be from substituted or unsubstituted uridines as illustrated in prepared as illustrated in Scheme (Va): Scheme (VI), below:

Scheme (WI HO OH R6 2. s

R3 1 N. - O> CHOH 1SN ls H 3 HQ pH 10 62 R6 . -Y R 2. S 1 N. O CH-OH N. R6 o21 N3 4.2no R3 5 a NN - O > CHOH C4 reactive u/ center

acid-catalyzed deprotection US 8,178,671 B2 56 -continued R6 R 6 1 1) POX, 1SN1SN1L2 N1"N,L 2) 6 H 3 H

In Scheme (VI), R. R. R. R. L., Land X are as previ for Scheme (VI) to yield a 2.4-pyrimidinediamine according ously defined for Scheme (I) and the superscript PG repre to structural formula (I). sents a protecting group, as discussed in connection with Although Schemes (VI) and (VII) are exemplified with Scheme (IIb). According to Scheme (VI), uridine 60 has a C4 15 ribosylnucleosides, skilled artisans will appreciate that the reactive center such that reaction with amine 10 or protected amine 21 yields N4-substituted cytidine 62 or 64, respec corresponding 2'-deoxyribo and 2',3'-dideoxyribo nucleo tively. Acid-catalyzed deprotection of N4-substituted 62 or sides, as well as nucleosides including Sugars or Sugar ana 64 (when “PG’ represents an acid-labile protecting group) logs other than ribose, would also work. yields N4-substituted cytosine 28, which may be subse Numerous uridines and cytidines useful as starting mate quently halogenated at the C2-position and reacted with rials in Schemes (VI) and (VII) are known in the art, and amine 6 to yield a 2.4-pyrimidinediamine according to struc include, by way of example and not limitation, 5-trifluorom tural formula (I). ethyl-2'-deoxycytidine (Chem. Sources #ABCR F07669; Cytidines may also be used as starting materials in an CAS Registry 66,384-66-5); 5-bromouridine (Chem. analogous manner, as illustrated in Scheme (VII), below: Sources Int’l 2000; CAS Registry 957-75-5);5-iodo-2'-deox

Scheme (WII HO OH R6 2. s 6 R 1 N. - O > CH2OH 41 L2n1n N 4.1so HO OH 3 6 2. s r 62 R R 5 6 - > HO2. S OH 1 N. O CH2OH S. R6 5 6 HN1 N N 4.2no R 1 N. - O > CH2OH C4 reactive -/ 70 PGR4 -S N14 Nn.1 4. 2no center 3 64

acid-catalyzed deprotection R6 R6 R 6 R 6 5 21 NN 1) POX 5 21 NNE 2) 6 R4 Y L2SN 4 Nn.12 N1 L NR2 41'N,Y L2 1N1N So 3 3

60 In Scheme (VII), R. R. R. R. L. L and X are as yuridine (Aldrich #1-775-6; CAS Registry 54-42-2); 5-fluo previously defined in Scheme (I) and the superscript PG rouridine (Aldrich #32.937-1; CAS Registry 316-46-1);5-io represents a protecting group as discussed above. Referring to douridine (Aldrich #85,259-7: CAS Registry 1024-99-3); Scheme (VII), like uridine 60, cytidine 70 has a C4 reactive 5-(trifluoromethyl)uridine (Chem. Sources Int’l 2000; CAS center such that reaction with amine 10 or protected amine 21 65 Registry 70-00-8); 5-trifluoromethyl-2'-deoxyuridine yields N4-substituted cytidine 62 or 64, respectively. These (Chem. Sources Int’l 2000; CAS Registry 70-00-8). Addi cytidines 62 and 64 are then treated as previously described tional uridines and cytidines that can be used as starting US 8,178,671 B2 materials in Schemes (VI) and (VII) are available from Gen eral Intermediates of Canada, Inc., Edmonton, Alberta, CA (www.generalintermediates.com) and/or Interchim, France (www.interchim.com), or may be prepared using standard techniques. Myriad textbook references teaching Suitable s synthetic methods are provided infra. The 2.4-pyrimidinediamine compounds of the invention can also be synthesized from Substituted pyrimidines, such as chloro-substituted pyrimidines, as illustrated in Schemes (VIII) and (IX), below:

Scheme (VIII L2 C HN1 N R4 6 6

sa YN1 Hess10 sa-YN l 1 equiv L L R21"L NN is 2YN1 Lin R2 21' N, 1N1YN1N in 2 H 3 H H 3 H 82 84 L C C HN1 NR2 6 6 6 sa-YN 6 say NN 10 6 sa-YN S. ls Sa L L2 Sn l L C1 4 n N123 no e-N-N-Ns3 rN-N-N-se3 8O 81 85

HN1 L NR2 6 saf 21'NN1SN1L n1"N,L H 3 H 83

Scheme (IX Air

C 6 C 1YN C 21 6NN 21 L NN1 NN1)-N1"N, L L 5 N ls H 973 H R2 Y SN 4 N1 2 No 3 91 Suzuki C C SR C 6 C 6 RSNa C 6 21 NN 6 21 NN 94 21 NN b C1 4 NNN1 ls 2 No 21'L N, 1N1SN1N L N2 21-L NN1 SaN1)-N1"N, L 3 H 3 H H 3 H 90 92 95 US 8,178,671 B2 59 60 -continued HN1 LN R2 past C 6 5 21 N1 C 6 L ls 5 21 NN R21 NN S. 2 C L S. ls L H 21"N, 1N1YN1"N, 93 H 3 H 99 C 6 -N1S 1 n1'N, H 3 H 99

In Schemes (VIII) and (IX), R. R. L., Land R are as 20 -continued previously defined for structural formula (I) and 'Ar' repre- R6 sents an aryl group. Referring to Scheme (VIII), reaction of 6 2,4,6-trichloropyrimidine 8O (Aldrich #T5,620-0; R 21 Y O CASi3764-01-0) with amine 6 yields a mixture of three 5 compounds: Substituted pyrimidine mono-, di- and triamines 25 -IS N ls Z 81, 82 and 83, which can be separated and isolated using R4 N 4 N 2 N NHR HPLC or other conventional techniques. Mono- and diamines 104 81 and 82 may be further reacted with amines 6 and/or 10 to 6 yield N2.N4.N6-trisubstituted-2,4,6-pyrimidinetriamines 84 R and 85, respectively. 30 R 6 N2.N4-bis-substituted-2,4-pyrimidinediamines- - - - - can be 5 21 N 21 --O O 102 prepared in a manner analogous to Scheme (VIII) by employ- L2 N ls S. ing 2,4-dichloro-5-methylpyrimidine or 2,4-dichloro-pyri- R41 SN 4 N 2 N OR midine as starting materials. In this instance, the mono-Sub- 35 106 stituted pyrimidineamine corresponding to compound 81 is 6 not obtained. Instead, the reaction proceeds to yield the R N2.N4-bis-substituted-2,4-pyrimidinediamine directly. R 6 O Referring to Scheme (IX), 2,4,5,6-tetrachloropyrimidine 5 a NN 21 --O 90 (Aldrich #24,671-9; CASH 1780-40-1) is reacted with " L2 S. l N excess amine 6 to yield a mixture of three compounds: 91.92, R41 SN 4 n.12 N NHR and 93, which can be separated and isolated using HPLC or 3 other conventional techniques. As illustrated, N2.N4-bis-sub- 108 stituted-5,6-dichloro-2,4-pyrimidinediamine 92 may be fur- 45 ther reacted at th C6 twith, El Ellis In Scheme (X), R. R. R. L. and R are as previously agent 94 to yie compoun 95. A ternatively, compoun 92 defined for structural formula (I). Each R" is independently can be converted into N2.N4-bis-subsituted-5-chloro-6-aryl 2.4-pyrimidinediamnine- - - - - 97 via a Suzuki reaction. 2,4-Pyri an R', and may be the same or different from the illustrated ------R. Referring to Scheme (X), carboxylic acid or ester 100 midinediamine 95 may be converted to 2.4-pyrimidinedi 50 may be converted to amide 104 by reaction with amine 102. In amine 99 by reaction with Bn SnH. amine 102, R'maybe the same or different than R of acidor As will be recognized by skilled artisans, 2.4-pyrim ester 100. Similarly, carbonate ester 106 may be converted to idinediamines according to the invention, synthesized via the carbamate 108. exemplary methods described above or by other well-known means, may also be utilized as starting materials and/or inter 55 A second specific example is illustrated in Scheme (XI), mediates to synthesize additional 2.4-pyrimidinediamine below: compounds of the invention. A specific example is illustrated in Scheme (X), below: Scheme (X Scheme (XI 60 R6 6 R Y O HNR2 R 6 (CH3)2SBH 21 N1 Y O Her is 5 s.l. M He112 41'N1SN1L2 1 l ns OC)/ {OR 102 R41 N in 2 N NRCRC H 3. H 65 3 H 110 US 8,178,671 B2 62 -continued cyclic Compounds, Volume 52 (Weissberger, A. and Taylor, E. R6 C., Ed.), 1994, John Wiley & Sons, Inc., New York, pp. 6 1-1509 (Brown IV"); Kenner, G. W. and Todd, A., in Hetero R cyclic Compounds, Volume 6. (Elderfield, R. C., Ed.), 1957, 1 Y 5 John Wiley, New York, Chapter 7 (pyrimidines); Paquette, L. 1SN1SN1is 2s. 1. ns / NRCRC A., Principles of Modern Heterocyclic Chemistry, 1968, W. H 3 H A. Benjamin, Inc., New York, pp. 1-401 (uracil synthesis pp. 114 313, 315; pyrimidine synthesis pp. 313-316; amino pyrimi R6 dine synthesis pp. 315); Joule, J. A., Mills, K. and Smith, G. O 10 F., Heterocyclic Chemistry, 3" Edition, 1995, Chapman and R 6 Hall, London, UK, pp. 1-516; Vorbrüggen, H. and Ruh 1YN 4N 112 Pohlenz, C., Handbook of Nucleoside Synthesis, John Wiley ls --O NRCRC -> & Sons, New York, 2001, pp. 1-631 (protection of pyrim 1 L2''n. 4 N 2 N R4 N N N idines by acylation pp. 90–91; silylation of pyrimidines pp. 3 H 15 91-93); Joule, J. A., Mills, K. and Smith, G. F., Heterocyclic 116 Chemistry, 4" Edition, 2000, Blackwell Science, Ltd, R6 Oxford, UK, pp. 1-589; and Comprehensive Organic Synthe R 6 sis, Volumes 1-9 (Trost, B. M. and Fleming, I., Ed.), 1991, 1 N1 21 W V Pergamon Press, Oxford, UK. 2 l --O NR'R' 20 It should be understood by the skilled artisan that in 1SN S-3S1s Schemes I through XI, the N4 nitrogen can be substituted by H 3 H R" as described throughout the specification and in the examples provided herein. In Scheme (XI), R. R. R. Li and R are as previously 6.4. Inhibition of Fc Receptor Signal Cascades defined for structural formula (I). Referring to Scheme (XI), Active 2.4-pyrimidinediamine compounds of the invention amide 110 or 116 may be converted to amine 114 or 118, inhibit Fc receptor signalling cascades that lead to, among respectively, by borane reduction with borane methylsulfide other things, degranulation of cells. As a specific example, the complex 112. Other suitable reactions for synthesizing 2.4- compounds inhibit the FceRI and/or FcyR signal cascades pyrimidinediamine compounds from 2.4-pyrimidinediamine that lead to degranulation of immune cells Such as neutrophil. starting materials will be apparent to those of skill in the art. eosinophil, mast and/or basophil cells. Both mast and baso Although many of the synthetic schemes discussed above phil cells play a central role in allergen-induced disorders, do not illustrate the use of protecting groups, skilled artisans including, for example, allergic rhinitis and asthma. Refer will recognize that in some instances substituents R. R. R. 35 ring to FIG. 1, upon exposure allergens, which may be, R, L' and/or Li may include functional groups requiring among other things, pollen or parasites, allergen-specific IgE protection. The exact identity of the protecting group used antibodies are synthesized by B-cells activated by IL-4 (or will depend upon, among other things, the identity of the IL-13) and other messengers to Switch to IgE class specific functional group being protected and the reaction conditions antibody synthesis. These allergen-specific IgEs bind to the used in the particular synthetic scheme, and will be apparent 40 high affinity FceRI. Upon binding of antigen, the FceRI to those of skill in the art. Guidance for selecting protecting bound IgEs are cross-linked and the IgE receptor signal trans groups and chemistries for their attachment and removal Suit duction pathway is activated, which leads to degranulation of able for a particular application can be found, for example, in the cells and consequent release and/or synthesis of a host of Greene & Wuts, supra. chemical mediators, including histamine, proteases (e.g., Prodrugs according to structural formula (II) may be pre- 45 tryptase and chymase), lipid mediators such as leukotrienes pared by routine modification of the above-described meth (e.g., LTC4), platelet-activating factor (PAF) and prostaglan ods. Alternatively. Such prodrugs may be prepared by reacting dins (e.g., PGD2) and a series of cytokines, including TNF-C. a suitably protected 2.4-pyrimidinediamine of structural for IL-4, IL-13, IL-5, IL-6, IL-8, GMCSF, VEGF and TGF-B. mula (I) with a Suitable progroup. Conditions for carrying out The release and/or synthesis of these mediators from mast Such reactions and for deprotecting the product to yield a 50 and/or basophil cells accounts for the early and late stage prodrug of formula (II) are well-known. responses induced by allergens, and is directly linked to Myriad references teaching methods useful for synthesiz downstream events that lead to a Sustained inflammatory ing pyrimidines generally, as well as starting materials State. described in Schemes (I)-(IX), are known in the art. For The molecular events in the FceRI signal transduction specific guidance, the reader is referred to Brown, D.J., “The 55 pathway that lead to release of preformed mediators via Pyrimidines', in The Chemistry of Heterocyclic Compounds, degranulation and release and/or synthesis of other chemical Volume 16 (Weissberger, A., Ed.), 1962, Interscience Publish mediators are well-known and are illustrated in FIG. 2. Refer ers, (A Division of John Wiley & Sons), New York (“Brown ring to FIG. 2, the FceRI is a heterotetrameric receptor com I”); Brown, D. J., “The Pyrimidines', in The Chemistry of posed of an IgE-binding alpha-Subunit, a beta Subunit, and Heterocyclic Compounds, Volume 16, Supplement I (Weiss- 60 two gamma Subunits (gamma homodimer). Cross-linking of berger, A. and Taylor, E. C., Ed.), 1970, Wiley-Interscience, FceRI-bound IgE by multivalent binding agents (including, (A Division of John Wiley & Sons), New York (Brown II'); for example IgE-specific allergens or anti-IgE antibodies or Brown, D.J., “The Pyrimidines', in The Chemistry of Het fragments) induces the rapid association and activation of the erocyclic Compounds, Volume 16, Supplement II (Weiss Src-related kinase Lyn. Lyn phosphorylates immunoreceptor berger, A. and Taylor, E. C., Ed.), 1985, An Interscience 65 tyrosine-based activation motifs (ITAMS) on the intracellular Publication (John Wiley & Sons), New York (“Brown III'); beta and gamma Subunits, which leads to the recruitment of Brown, D.J., “The Pyrimidines’ in The Chemistry of Hetero additional Lyn to the beta subunit and Syk kinase to the US 8,178,671 B2 63 64 gamma homodimer. These receptor-associated kinases, types of immune cells that degranulate upon activation of the which are activated by intra- and intermolecular phosphory FceRI signaling cascade may also be used, including, for lation, phosphorylate other components of the pathway, Such example, eosinophils. as the Btkkinase, LAT, and phospholipase C-gamma PLC As will be recognized by skilled artisans, the mediator or gamma). Activated PLC-gamma initiates pathways that lead agent quantified is not critical. The only requirement is that it to protein kinase C activation and Ca" mobilization, both of be a mediator or agent released and/or synthesized as a con which are required for degranulation. FceR1 cross-linking sequence of initiating or activating the Fc receptor signaling also activates the three major classes of mitogen activated cascade. For example, referring to FIG. 1, activation of the protein (MAP) kinases, i.e. ERK 1/2, JNK1/2, and p38. Acti FceRI signaling cascade in mast and/or basophil cells leads to Vation of these pathways is important in the transcriptional 10 numerous downstream events. For example, activation of the FceRI signal cascade leads to the immediate release (i.e., regulation of proinflammatory mediators, such as TNF-C. and within 1-3 min. following receptor activation) of a variety of IL-6, as well as the lipid mediator leukotriene CA (LTC4). Although not illustrated, the FcyR signaling cascade is preformed chemical mediators and agents via degranulation. believed to share some common elements with the FceRI Thus, in one embodiment, the mediator or agent quantified 15 may be specific to granules (i.e., present in granules but not in signaling cascade. Importantly, like FceRI, the FcyRI the cell cytoplasm generally). Examples of granule-specific includes a gamma homodimer that is phosphorylated and mediators or agents that can be quantified to determine and/or recruits Syk, and like FceRI, activation of the FcyRI signaling confirm the activity of a 2.4-pyrimidinediamine compound of cascade leads to, among other things, degranulation. Other Fc the invention include, but are not limited to, granule-specific receptors that share the gamma homodimer, and which can be enzymes such as hexosaminidase and tryptase and granule regulated by the active 2.4-pyrimidinediamine compounds specific components such as histamine and serotonin. Assays include, but are not limited to, FcCRI and Fcy III. for quantifying such factors are well-known, and in many The ability of the 2.4-pyrimidinediamine compounds of instances are commercially available. For example, tryptase the invention to inhibit Fc receptor signaling cascades may be and/or hexosaminidase release may be quantified by incubat simply determined or confirmed in in vitro assays. Suitable 25 ing the cells with cleavable substrates that fluoresce upon assays for confirming inhibition of FceRI-mediated degranu cleavage and quantifying the amount of fluorescence pro lation are provided in the Examples section. In one typical duced using conventional techniques. Such cleavable fluoro assay, cells capable of undergoing FceRI-mediated degranu genic Substrates are commercially available. For example, the lation, Such as mast or basophil cells, are first grown in the fluorogenic Substrates Z-Gly-Pro-Arg-AMC 30 (Z=benzyloxycarbonyl: AMC-7-amino-4-methylcoumarin; presence of IL-4, Stem Cell Factor (SCF), IL-6 and IgE to BIOMOL Research Laboratories, Inc., Plymouth Meeting, increase expression of the FceRI, exposed to a 2.4-pyrim Pa. 19462, Catalog No. P-142) and Z-Ala-Lys-Arg-AMC idinediamine test compound of the invention and stimulated (Enzyme Systems Products, a division of ICN Biomedicals, with anti-IgE antibodies (or, alternatively, an IgE-specific Inc., Livermore, Calif. 94.550, Catalog No. AMC-246) can be allergen). Following incubation, the amount of a chemical 35 used to quantify the amount of tryptase released. The fluoro mediator or other chemical agent released and/or synthesized genic substrate 4-methylumbelliferyl-N-acetyl-B-D-glu as a consequence of activating the FceRI signaling cascade cosaminide (Sigma, St. Louis, Mo., Catalog #69585) can be may be quantified using standard techniques and compared to used to quantify the amount of hexosaminidase released. the amount of the mediator or agent released from control Histamine release may be quantified using a commercially cells (i.e., cells that are stimulated but that are not exposed to 40 available enzyme-linked immunosorbent assay (ELISA) test compound). The concentration of test compound that such as Immunotech histamine ELISA assay #IM2015 yields a 50% reduction in the quantity of the mediator or agent (Beckman-Coulter, Inc.). Specific methods of quantifying the measured as compared to control cells is the ICso of the test release of tryptase, hexosaminidase and histamine are pro compound. The origin of the mastor basophil cells used in the vided in the Examples section. Any of these assays may be assay will depend, in part, on the desired use for the com 45 used to determine or confirm the activity of the 2.4-pyrim pounds and will be apparent to those of skill in the art. For idinediamine compounds of the invention. example, if the compounds will be used to treat or prevent a Referring again to FIG. 1. degranulation is only one of particular disease in humans, a convenient source of mast or several responses initiated by the FceRI signaling cascade. In basophil cells is a human or other animal which constitutes an addition, activation of this signaling pathway leads to the de accepted or known clinical model for the particular disease. 50 novo synthesis and release of cytokines and chemokines Such Thus, depending upon the particular application, the mast or as IL-4, IL-5, IL-6, TNF-C., IL-13 and MIP1-C), and release basophil cells may be derived from a wide variety of animal of lipid mediators such as leukotrienes (e.g., LTC4), platelet Sources, ranging from, for example, lower mammals such as activating factor (PAF) and prostaglandins. Accordingly, the mice and rats, to dogs, sheep and other mammals commonly 2.4-pyrimidinediamine compounds of the invention may also employed in clinical testing, to higher mammals such as 55 be assessed for activity by quantifying the amount of one or monkeys, chimpanzees and apes, to humans. Specific more of these mediators released and/or synthesized by acti examples of cells Suitable for carrying out the in vitro assays vated cells. include, but are not limited to, rodent or human basophil cells, Unlike the granule-specific components discussed above, rat basophil leukemia cell lines, primary mouse mast cells these “late stage' mediators are not released immediately (such as bone marrow-derived mouse mast cells “BMMC) 60 following activation of the FceRI signaling cascade. Accord and primary human mast cells isolated from cord blood ingly, when quantifying these late stage mediators, care (“CHMC) or other tissues such as lung. Methods for isolat should be taken to insure that the activated cell culture is ing and culturing these cell types are well-known or are incubated for a time sufficient to result in the synthesis (if provided in the Examples section (see, e.g., Demo et al., necessary) and release of the mediator being quantified. Gen 1999, Cytometry 36(4):340-348 and copending application 65 erally, PAF and lipid mediators such as leukotriene C4 are Ser. No. 10/053,355, filed Nov. 8, 2001, the disclosures of released 3-30 min. following FceRI activation. The cytokines which are incorporated herein by reference). Of course, other and other late stage mediators are released approx. 4-8 hrs. US 8,178,671 B2 65 66 following FceRI activation. Incubation times suitable for a (ies) of mediators for which ICs data should be ascertained specific mediator will be apparent to those of skill in the art. for a particular compound and application will be apparent to Specific guidance and assays are provided in the Examples those of skill in the art. section. Similar assays may be utilized to confirm inhibition of The amount of a particular late stage mediator released 5 signal transduction cascades initiated by other Fc receptors, may be quantified using any standard technique. In one such as FcCRI, FcyRI and/or Fcy III signaling, with routine embodiment, the amount(s) may be quantified using ELISA modification. For example, the ability of the compounds to assays. ELISA assay kits suitable for quantifying the amount inhibit FcyRI signal transduction may be confirmed in assays of TNFO, IL-4, IL-5, IL-6 and/or IL-13 released are available similar to those described above, with the exception that the 10 FcyRI signaling cascade is activated, for example by incubat from, for example, BioSource International, Inc., Camarillo, ing the cells with IgG and an IgG-specific allergen or anti Calif. 93012 (see, e.g., Catalog Nos. KHC3011, KHC0042, body, instead of IgE and an IgE-specificallergen orantibody. KHC0052, KHC0061 and KHC0132). ELISA assay kits suit Suitable cell types, activating agents and agents to quantify to able for quantifying the amount of leukotriene C4 (LTC4) confirm inhibition of other Fc receptors, such as Fc receptors released from cells are available from Cayman Chemical Co., 15 that comprise a gamma homodimer, will be apparent to those Ann Arbor, Mich. 48108 (see, e.g., Catalog No. 520211). of skill in the art. Typically, active 2.4-pyrimidinediamine compounds of the One particularly useful class of compounds includes those invention will exhibit ICss with respect to FceRI-mediated 2.4-pyrimidinediamine compounds that inhibit the release of degranulation and/or mediator release or synthesis of about immediate granule-specific mediators and late stage media 20M or lower, as measured in an in vitro assay, such as one tors with approximately equivalent ICsos. By approximately of the in vitro assays described above or in the Examples equivalent is meant that the ICss for each mediator type are section. Of course, skilled artisans will appreciate that com within about a 10-fold range of one another. Another particu pounds which exhibit lower ICss, for example on the order of larly useful class of compounds includes those 2.4-pyrim 10 uM, 1 uM, 100 nM, 10 nM, 1 nM, or even lower, are idinediamine compounds that inhibit the release of immedi particularly useful. 25 ate granule-specific mediators, lipid mediators and cytokine Skilled artisans will also appreciate that the various media mediators with approximately equivalent ICsos. In a specific tors discussed above may induce different adverse effects or embodiment, such compounds inhibit the release of the fol exhibit different potencies with respect to the same adverse lowing mediators with approximately equivalent ICsos: his effect. For example, the lipid mediator LTC4 is a potent tamine, tryptase, hexosaminidase, IL-4, IL-5, IL-6, IL-13, vasoconstrictor it is approximately 1000-fold more potent 30 TNFC. and LTC4. Such compounds are particularly useful for, at inducing vasoconstriction than histamine. As another among other things, ameliorating or avoiding altogether both example, in addition to mediating atopic or Type I hypersen the early and late stage responses associated with atopic or sitivity reactions, cytokines can also cause tissue remodeling immediate Type I hypersensitivity reactions. and cell proliferation. Thus, although compounds that inhibit Ideally, the ability to inhibit the release of all desired types release and/or synthesis of any one of the previously dis 35 of mediators will reside in a single compound. However, cussed chemical mediators are useful, skilled artisans will mixtures of compounds can also be identified that achieve the appreciate that compounds which inhibit the release and/or same result. For example, a first compound which inhibits the synthesis of a plurality, or even all, of the previously release of granule specific mediators may be used in combi described mediators find particular use, as Such compounds nation with a second compound which inhibits the release are useful for ameliorating or avoiding altogether a plurality, 40 and/or synthesis of cytokine mediators. or even all, of the adverse effects induced by the particular In addition to the FceRI or FcyRI degranulation pathways mediators. For example, compounds which inhibit the release discussed above, degranulation of mast and/or basophil cells of all three types of mediators granule-specific, lipid and can be induced by other agents. For example, ionomycin, a cytokine—are useful for treating or preventing immediate calcium ionophore that bypasses the early FceRI or FcyRI Type I hypersensitivity reactions as well as the chronic symp 45 signal transduction machinery of the cell, directly induces a toms associated therewith. calcium flux that triggers degranulation. Referring again to Compounds of the invention capable of inhibiting the FIG. 2, activated PLCY initiates pathways that lead to, among release of more than one type of mediator (e.g., granule other things, calcium ion mobilization and Subsequent specific or late stage) may be identified by determining the degranulation. As illustrated, this Ca" mobilization is trig ICso with respect to a mediator representative of each class 50 gered late in the FceRI signal transduction pathway. As men using the various in vitro assays described above (or other tioned above, and as illustrated in FIG.3, ionomycin directly equivalent in vitro assays). Compounds of the invention induces Ca" mobilization and a Ca" flux that leads to which are capable of inhibiting the release of more than one degranulation. Other ionophores that induce degranulation in mediator type will typically exhibit an ICs for each mediator this manner include A23 187. The ability of granulation-in type tested of less than about 20 uM. For example, a com 55 ducing ionophores such as ionomycin to bypass the early pound which exhibits an ICs of 1 uM with respect to hista stages of the FceRI and/or FcyRI signaling cascades may be mine release (ICso"") and an ICs of 1 nM with respect used as a counter screen to identify active compounds of the to leukotriene LTC4 synthesis and/or release (ICs) invention that specifically exert their degranulation-inhibi inhibits both immediate (granule-specific) and late stage tory activity by blocking or inhibiting the early FceRI or mediator release. As another specific example, a compound 60 FcyRI signaling cascades, as discussed above. Compounds that exhibits an ICs'P' of 10M, an ICs of 1 uMand which specifically inhibit such early FceRI or FcyRI-medi an ICs" of 1 M inhibits immediate (granule-specific), ated degranulation inhibit not only degranulation and Subse lipid and cytokine mediator release. Although the above spe quent rapid release of histamine, tryptase and other granule cific examples utilize the ICsos of one representative mediator contents, but also inhibit the pro-inflammatory activation of each class, skilled artisans will appreciate that the ICsos of 65 pathways causing the release of TNFO, IL-4, IL-13 and the a plurality, or even all, mediators comprising one or more of lipid mediators such as LTC4. Thus, compounds which spe the classes may be obtained. The quantity(ies) and identity cifically inhibit such early FceRI and/or FcyRI-mediated US 8,178,671 B2 67 68 degranulation block or inhibit not only acute atopic or Type I Specific examples of biochemical and cellular assays Suitable hypersensitivity reactions, but also late responses involving for confirming the activity of the 2.4-pyrimidinediamine multiple inflammatory mediators. compounds are provided in the Examples section. Compounds of the invention that specifically inhibit early Generally, compounds that are Syk kinase inhibitors will FceRI and/or FcyRI-mediated degranulation are those com exhibit an ICs with respect to a Syk kinase activity, such as pounds that inhibit FceRI and/or FcyRI-mediated degranula the ability of Syk kinase to phosphorylate a synthetic or tion (for example, have an ICs of less than about 20 uM with endogenous Substrate, in an in vitro or cellular assay in the respect to the release of a granule-specific mediator or com range of about 20 uM or less. Skilled artisans will appreciate ponent as measured in an in vitro assay with cells stimulated that compounds that exhibit lower ICsos, such as in the range with an IgE or IgG binding agent) but that do not appreciably 10 of 10 uM, 1 uM, 100 nM, 10 nM, 1 nM, or even lower, are inhibit ionophore-induced degranulation. In one embodi particularly useful. ment, compounds are considered to not appreciably inhibit ionophore-induced degranulation if they exhibit an ICso of 6.5 Uses and Compositions ionophore-induced degranulation of greater than about 20 uM, as measured in an in vitro assay. Of course, active com 15 As previously discussed, the active compounds of the pounds that exhibit even higher ICss of ionophore-induced invention inhibit Fc receptor signaling cascades, especially degranulation, or that do not inhibit ionophore-induced those Fc receptors including a gammahomodimer, such as the degranulation at all, are particularly useful. In another FceRI and/or FcyRI signaling cascades, that lead to, among embodiment, compounds are considered to not appreciably other things, the release and/or synthesis of chemical media inhibit ionophore-induced degranulation if they exhibit a tors from cells, either via degranulation or other processes. As greater than 10-fold difference in their ICss of FceRI and/or also discussed, the active compounds are also potent inhibi FcyRI-mediated degranulation and ionophore-induced tors of Syk kinase. As a consequence of these activities, the degranulation, as measured in an in vitro assay. Assays Suit active compounds of the invention may be used in a variety of able for determining the ICso of ionophore-induced degranu in vitro, in vivo and ex vivo contexts to regulate or inhibit Syk lation include any of the previously-described degranulation 25 kinase, signaling cascades in which Syk kinase plays a role, assays, with the modification that the cells are stimulated or Fc receptor signaling cascades, and the biological responses activated with a degranulation-inducing calcium ionophore effected by Such signaling cascades. For example, in one such as ionomycin or A23 187 (A.G. Scientific, San Diego, embodiment, the compounds may be used to inhibit Syk Calif.) instead of anti-IgE antibodies or an IgE-specificaller kinase, either in vitro or in vivo, in virtually any cell type gen. Specific assays for assessing the ability of a particular 30 expressing Syk kinase. They may also be used to regulate 2.4-pyrimidinediamine compound of the invention to inhibit signal transduction cascades in which Sykkinase plays a role. ionophore-induced degranulation are provided in the Such Syk-dependent signal transduction cascades include, Examples section. but are not limited to, the FceRI, FcyRI, FcyRIII, BCR and As will be recognized by skilled artisans, compounds integrin signal transduction cascades. The compounds may which exhibit a high degree of selectivity of FceRI-mediated 35 also be used in vitro or in Vivo to regulate, and in particular degranulation find particular use, as such compounds selec inhibit, cellular or biological responses effected by such Syk tively target the FceRI cascade and do not interfere with other dependent signal transduction cascades. Such cellular or bio degranulation mechanisms. Similarly, compounds which logical responses include, but are not limited to, respiratory exhibit a high degree of selectivity of FcyRI-mediated burst, cellular adhesion, cellular degranulation, cell spread degranulation find particular use, as such compounds selec 40 ing, cell migration, cell aggregation, phagcytosis, cytokine tively target the FcyRI cascade and do not interfere with other synthesis and release, cell maturation and Ca" flux. Impor degranulation mechanisms. Compounds which exhibit a high tantly, the compounds may be used to inhibit Syk kinase in degree of selectivity are generally 10-fold or more selective Vivo as a therapeutic approach towards the treatment or pre for FceRI- or FcyRI-mediated degranulation over ionophore vention of diseases mediated, either wholly or in part, by a induced degranulation, Such as ionomycin-induced degranu 45 Syk kinase activity. Non-limiting examples of Syk kinase lation. mediated diseases that may be treated or prevented with the Accordingly, the activity of the 2.4-pyrimidinediamine compounds are those discussed in more detail, below. compounds of the invention may also be confirmed in bio In another embodiment, the active compounds may be used chemical or cellular assays of Syk kinase activity. Referring to regulate or inhibit the Fc receptor signaling cascades and/or again to FIG. 2, in the FceRI signaling cascade in mast and/or 50 FceRI- and/or FcyRI-mediated degranulation as a therapeutic basophil cells, Syk kinase phosphorylates LAT and PLC approach towards the treatment or prevention of diseases gammal, which leads to, among other things, degranulation. characterized by, caused by and/or associated with the release Any of these activities may be used to confirm the activity of or synthesis of chemical mediators of Such Fc receptor sig the 2.4-pyrimidinediamine compounds of the invention. In naling cascades or degranulation. Such treatments may be one embodiment, the activity is confirmed by contacting an 55 administered to animals in Veterinary contexts or to humans. isolated Syk kinase, or an active fragment thereof with a Diseases that are characterized by, caused by or associated 2.4-pyrimidinediamine compound in the presence of a Syk with Such mediator release, synthesis or degranulation, and kinase Substrate (e.g., a synthetic peptide or a protein that is that can therefore be treated or prevented with the active known to be phophorylated by Syk in a signaling cascade) compounds include, by way of example and not limitation, and assessing whether the Syk kinase phosphorylated the 60 atopy or anaphylactic hypersensitivity or allergic reactions, substrate. Alternatively, the assay may be carried out with allergies (e.g., allergic conjunctivitis, allergic rhinitis, atopic cells that express a Syk kinase. The cells may express the Syk asthma, atopic dermatitis and food allergies), low grade scar kinase endogenously or they may be engineered to express a ring (e.g., of Scleroderma, increased fibrosis, keloids, post recombinant Syk kinase. The cells may optionally also Surgical scars, pulmonary fibrosis, vascular spasms, express the Syk kinase substrate. Cells suitable for perform 65 migraine, reperfusion injury and post myocardial infarction), ing Such confirmation assays, as well as methods of engineer diseases associated with tissue destruction (e.g., of COPD, ing suitable cells will be apparent to those of skill in the art. cardiobronchitis and post myocardial infarction), diseases US 8,178,671 B2 69 70 associated with tissue inflammation (e.g., irritable bowel syn Reiter's syndrome, polymyositis-dermatomyositis, systemic drome, spastic colon and inflammatory bowel disease), Sclerosis, polyarteritis nodosa, multiple Sclerosis and bullous inflammation and Scarring. pemphigoid. In addition to the myriad diseases discussed above, cellular It will be appreciated by skilled artisans that many of the and animal empirical data confirm that the 2.4-pyrimidinedi 5 above-listed autoimmune diseases are associated with severe amine compounds described herein are also useful for the symptoms, the amelioration of which provides significant treatment or prevention of autoimmune diseases, as well as therapeutic benefit even in instances where the underlying the various symptoms associated with Such diseases. The autoimmune disease may not be ameliorated. Many of these types of autoimmune diseases that may be treated or pre symptoms, as well as their underlying disease states, result as 10 a consequence of activating the FcyR signaling cascade in vented with the 2.4-pyrimidinediamine compounds generally monocyte cells. As the 2.4-pyrimidinediamine compounds include those disorders involving tissue injury that occurs as described herein are potent inhibitors of such FcyR signaling a result of a humoral and/or cell-mediated response to immu in monocytes and other cells, the methods find use in the nogens or antigens of endogenous and/or exogenous origin. treatment and/or prevention of myriad adverse symptoms Such diseases are frequently referred to as diseases involving 15 associated with the above-listed autoimmune diseases. the nonanaphylactic (i.e., Type II, Type III and/or Type IV) As a specific example, rheumatoid arthritis (RA) typically hypersensitivity reactions. results in Swelling, pain, loss of motion and tenderness of As discussed previously, Type I hypersensitivity reactions target joints throughout the body. RA is characterized by generally result from the release of pharmacologically active chronically inflamed synovium that is densely crowded with Substances, such as histamine, from mast and/or basophil lymphocytes. The synovial membrane, which is typically one cells following contact with a specific exogenous antigen. As cell layer thick, becomes intensely cellular and assumes a mentioned above, such Type I reactions play a role in numer form similar to lymphoid tissue, including dentritic cells, T-, ous diseases, including allergic asthma, allergic rhinitis, etc. B- and NK cells, macrophages and clusters of plasma cells. Type II hypersensitivity reactions (also referred to as cyto This process, as well as a plethora of immunopathological toxic, cytolytic complement-dependent or cell-stimulating 25 mechanisms including the formation of antigen-immunoglo hypersensitivity reactions) result when immunoglobulins bulin complexes, eventually result in destruction of the integ react with antigenic components of cells or tissue, or with an rity of the joint, resulting in deformity, permanent loss of antigen or hapten that has become intimately coupled to cells function and/or bone erosion at or near the joint. The methods or tissue. Diseases that are commonly associated with Type II may be used to treat or ameliorate any one, several or all of 30 these symptoms of RA. Thus, in the context of RA, the meth hypersensitivity reactions include, but are not limited, to ods are considered to provide therapeutic benefit (discussed autoimmune hemolytic anemia, erythroblastosis fetalis and more generally, infra) when a reduction or amelioration of Goodpasture's disease. any of the symptoms commonly associated with RA is Type III hypersensitivity reactions, (also referred to as achieved, regardless of whether the treatment results in a toxic complex, soluble complex, or immune complex hyper 35 concomitant treatment of the underlying RA and/or a reduc sensitivity reactions) result from the deposition of soluble tion in the amount of circulating rheumatoid factor (“RF). circulating antigen-immunoglobulin complexes in vessels or As another specific example, systemic lupus erythematosis in tissues, with accompanying acute inflammatory reactions (“SLE) is typically associated with symptoms such as fever, at the site of immune complex deposition. Non-limiting joint pain (arthralgias), arthritis, and serositis (pleurisy or examples of prototypical Type III reaction diseases include 40 pericarditis). In the context of SLE, the methods are consid the Arthus reaction, rheumatoid arthritis, serum sickness, sys ered to provide therapeutic benefit when a reduction or ame temic lupus erythematosis, certain types of glomerulonephri lioration of any of the symptoms commonly associated with tis, multiple Sclerosis and bullous pemphingoid. SLE are achieved, regardless of whether the treatment results Type IV hypersensitivity reactions (frequently called cel in a concomitant treatment of the underlying SLE. lular, cell-mediated, delayed, or tuberculin-type hypersensi 45 As another specific example, multiple sclerosis (“MS) tivity reactions) are caused by sensitized T-lymphocytes cripples the patient by disturbing visual acuity; stimulating which result from contact with a specific antigen. Non-limit double vision; disturbing motor functions affecting walking ing examples of diseases cited as involving Type IV reactions and use of the hands; producing bowel and bladder inconti are contact dermatitis and allograft rejection including, but nence; spasticity; and sensory deficits (touch, pain and tem not limited to, heart transplant. 50 perature sensitivity). In the context of MS, the methods are Autoimmune diseases associated with any of the above considered to provide therapeutic benefit when an improve nonanaphylactic hypersensitivity reactions may be treated or ment or a reduction in the progression of any one or more of prevented with the 2.4-pyrimidinediamine compounds of the the crippling effects commonly associated with MS is invention. In particular, the methods may be used to treat or achieved, regardless of whether the treatment results in a prevent those autoimmune diseases frequently characterized 55 concomitant treatment of the underlying MS. as single organ or single cell-type autoimmune disorders When used to treat or prevent such diseases, the active including, but not limited to: Hashimoto's thyroiditis, compounds may be administered singly, as mixtures of one or autoimmune hemolytic anemia, autoimmune atrophic gastri more active compounds or in mixture or combination with tis of pernicious anemia, autoimmune encephalomyelitis, other agents useful for treating Such diseases and/or the autoimmune orchitis, Goodpasture's disease, autoimmune 60 symptoms associated with Such diseases. The active com thrombocytopenia, sympathetic ophthalmia, myasthenia pounds may also be administered in mixture or in combina gravis, Graves disease, primary biliary cirrhosis, chronic tion with agents useful to treat other disorders or maladies, aggressive hepatitis, ulcerative colitis and membranous such as steroids, membrane stablizers, 5LO inhibitors, leu glomerulopathy, as well as those autoimmune diseases fre kotriene synthesis and receptor inhibitors, inhibitors of IgE quently characterized as involving systemic autoimmune dis 65 isotype Switching or IgE synthesis, IgG isotype Switching or order, which include but are not limited to: systemic lupus IgG synthesis, B-agonists, tryptase inhibitors, aspirin, COX erythematosis, rheumatoid arthritis, Sjogren's syndrome, inhibitors, methotrexate, anti-TNF drugs, retuxin, PD4 US 8,178,671 B2 71 72 inhibitors, p38 inhibitors, PDE4 inhibitors, and antihista with pharmaceutically acceptable additives Such as Suspend mines, to name a few. The active compounds may be admin ing agents (e.g., Sorbitol syrup, cellulose derivatives or hydro istered per se in the form of prodrugs or as pharmaceutical genated edible fats); emulsifying agents (e.g., lecithin or aca compositions, comprising an active compound or prodrug. cia); non-aqueous vehicles (e.g., almond oil, oily esters, ethyl Pharmaceutical compositions comprising the active com alcohol, CremophoreTM or fractionated vegetable oils); and pounds of the invention (or prodrugs thereof) may be manu preservatives (e.g., methyl or propyl-p-hydroxybenzoates or factured by means of conventional mixing, dissolving, granu Sorbic acid). The preparations may also contain buffer salts, lating, dragee-making levigating, emulsifying, preservatives, flavoring, coloring and Sweetening agents as encapsulating, entrapping or lyophilization processes. The appropriate. compositions may be formulated in conventional manner 10 Preparations for oral administration may be suitably for using one or more physiologically acceptable carriers, dilu mulated to give controlled release of the active compound or ents, excipients or auxiliaries which facilitate processing of prodrug, as is well known. the active compounds into preparations which can be used For buccal administration, the compositions may take the pharmaceutically. form of tablets or lozenges formulated in conventional man The active compound or prodrug may be formulated in the 15 . pharmaceutical compositions per se, or in the form of a For rectal and vaginal routes of administration, the active hydrate, Solvate, N-oxide or pharmaceutically acceptable compound(s) may be formulated as Solutions (for retention salt, as previously described. Typically, such salts are more enemas) suppositories or ointments containing conventional soluble in aqueous solutions than the corresponding free Suppository bases such as cocoa butter or other glycerides. acids and bases, but salts having lower solubility than the For nasal administration or administration by inhalation or corresponding free acids and bases may also be formed. insufflation, the active compound(s) or prodrug(s) can be Pharmaceutical compositions of the invention may take a conveniently delivered in the form of an aerosol spray from form suitable for virtually any mode of administration, pressurized packs or a nebulizer with the use of a suitable including, for example, topical, ocular, oral, buccal, systemic, propellant, e.g., dichlorodifluoromethane, trichlorofluo nasal, injection, transdermal, rectal, vaginal, etc., or a form 25 romethane, dichlorotetrafluoroethane, fluorocarbons, carbon suitable for administration by inhalation or insufflation. dioxide or other Suitable gas. In the case of a pressurized For topical administration, the active compound(s) or pro aerosol, the dosage unit may be determined by providing a drug(s) may be formulated as Solutions, gels, ointments, valve to deliver a metered amount. Capsules and cartridges creams, Suspensions, etc. as are well-known in the art. for use in an inhaler or insufflator (for example capsules and Systemic formulations include those designed for admin 30 cartridges comprised of gelatin) may be formulated contain istration by injection, e.g., Subcutaneous, intravenous, intra ingapowder mix of the compound and a suitable powder base muscular, intrathecal or intraperitoneal injection, as well as such as lactose or starch. those designed for transdermal, transmucosal oral or pulmo A specific example of an aqueous Suspension formulation nary administration. Suitable for nasal administration using commercially-avail Useful injectable preparations include Sterile Suspensions, 35 able nasal spray devices includes the following ingredients: Solutions or emulsions of the active compound(s) in aqueous active compound or prodrug (0.5-20 mg/ml); benzalkonium or oily vehicles. The compositions may also contain formu chloride (0.1-0.2 mg/mL); polysorbate 80 (TWEENR80; lating agents, such as Suspending, stabilizing and/or dispers 0.5-5 mg/ml); carboxymethylcellulose sodium or microcrys ing agent. The formulations for injection may be presented in talline cellulose (1-15 mg/ml); phenylethanol (1-4 mg/ml); unit dosage form, e.g., in ampules or in multidose containers, 40 and dextrose (20-50 mg/ml). The pH of the final suspension and may contain added preservatives. can be adjusted to range from about pH5 to pH7, with a pH of Alternatively, the injectable formulation may be provided about pH 5.5 being typical. in powder form for reconstitution with a suitable vehicle, Another specific example of an aqueous Suspension Suit including but not limited to sterile pyrogen free water, buffer, able for administration of the compounds via inhalation, and dextrose solution, etc., before use. To this end, the active 45 in particular for Such administration of a compound of the compound(s) may be dried by any art-known technique. Such invention, contains 1-20 mg/mL of the compound or prodrug, as lyophilization, and reconstituted prior to use. 0.1-1% (v/v) Polysorbate 80 (TWEENR80), 50 mM citrate For transmucosal administration, penetrants appropriate to and/or 0.9% sodium chloride. the barrier to be permeated are used in the formulation. Such For ocular administration, the active compound(s) or pro penetrants are known in the art. 50 drug(s) may be formulated as a solution, emulsion, Suspen For oral administration, the pharmaceutical compositions sion, etc. suitable for administration to the eye. A variety of may take the form of for example, lozenges, tablets or cap vehicles Suitable for administering compounds to the eye are Sules prepared by conventional means with pharmaceutically known in the art. Specific non-limiting examples are acceptable excipients such as binding agents (e.g., pregelati described in U.S. Pat. No. 6,261,547; U.S. Pat. No. 6, 197, nised maize starch, polyvinylpyrrolidone or hydroxypropyl 55 934; U.S. Pat. No. 6,056,950; U.S. Pat. No. 5,800,807; U.S. methylcellulose); fillers (e.g., lactose, microcrystalline cellu Pat. No. 5,776,445; U.S. Pat. No. 5,698,219; U.S. Pat. No. lose or calcium hydrogen phosphate); lubricants (e.g., mag 5,521.222; U.S. Pat. No. 5,403,841; U.S. Pat. No. 5,077,033; nesium Stearate, talc or silica); disintegrants (e.g., potato U.S. Pat. No. 4,882,150; and U.S. Pat. No. 4,738,851. starch or sodium starch glycolate); or wetting agents (e.g., For prolonged delivery, the active compound(s) or sodium lauryl sulfate). The tablets may be coated by methods 60 prodrug(s) can be formulated as a depot preparation for well known in the art with, for example, Sugars, films or administration by implantation or intramuscular injection. enteric coatings. The active ingredient may be formulated with suitable poly Liquid preparations for oral administration may take the meric or hydrophobic materials (e.g., as an emulsion in an form of for example, elixirs, Solutions, syrups or Suspen acceptable oil) or ion exchange resins, or as sparingly soluble sions, or they may be presented as a dry product for consti 65 derivatives, e.g., as a sparingly soluble salt. Alternatively, tution with water or other suitable vehicle before use. Such transdermal delivery systems manufactured as an adhesive liquid preparations may be prepared by conventional means disc or patch which slowly releases the active compound(s) US 8,178,671 B2 73 74 for percutaneous absorption may be used. To this end, per taking in activities which trigger asthma attacks to lessen the meation enhancers may be used to facilitate transdermal pen severity of, or avoid altogether, an asthmatic episode. etration of the active compound(s). Suitable transdermal The amount of compound administered will depend upon a patches are described in for example, U.S. Pat. No. 5,407, variety of factors, including, for example, the particular indi 713: U.S. Pat. No. 5,352,456; U.S. Pat. No. 5,332,213; U.S. cation being treated, the mode of administration, whether the Pat. No. 5,336,168; U.S. Pat. No. 5,290,561; U.S. Pat. No. desired benefit is prophylactic or therapeutic, the severity of 5,254,346; U.S. Pat. No. 5,164, 189: U.S. Pat. No. 5,163,899; the indication being treated and the age and weight of the U.S. Pat. No. 5,088,977; U.S. Pat. No. 5,087,240; U.S. Pat. patient, the bioavailability of the particular active compound, No. 5,008,110; and U.S. Pat. No. 4,921,475. etc. Determination of an effective dosage is well within the Alternatively, other pharmaceutical delivery systems may 10 capabilities of those skilled in the art. be employed. Liposomes and emulsions are well-known Effective dosages may be estimated initially from in vitro examples of delivery vehicles that may be used to deliver assays. For example, an initial dosage for use in animals may active compound(s) or prodrug(s). Certain organic solvents be formulated to achieve a circulating blood or serum con such as dimethylsulfoxide (DMSO) may also be employed, centration of active compound that is at or above an ICs of although usually at the cost of greater toxicity. 15 the particular compound as measured in as in vitro assay, Such The pharmaceutical compositions may, if desired, be pre as the in vitro CHMC or BMMC and other in vitro assays sented in a pack or dispenser device which may contain one or described in the Examples section. Calculating dosages to more unit dosage forms containing the active compound(s). achieve Such circulating blood or serum concentrations tak The pack may, for example, comprise metal or plastic foil, ing into account the bioavailability of the particular com Such as a blister pack. The pack or dispenser device may be pound is well within the capabilities of skilled artisans. For accompanied by instructions for administration. guidance, the reader is referred to Fingl & Woodbury, "Gen eral Principles. In: Goodman and Gilman's The Pharmaceu 6.6 Effective Dosages tical Basis of Therapeutics, Chapter 1, pp. 1-46, latest edition, Pagamonon Press, and the references cited therein. The active compound(s) or prodrug(s) of the invention, or 25 Initial dosages can also be estimated from in vivo data, compositions thereof, will generally be used in an amount Such as animal models. Animal models useful for testing the effective to achieve the intended result, for example in an efficacy of compounds to treat or prevent the various diseases amount effective to treat or prevent the particular disease described above are well-known in the art. Suitable animal being treated. The compound(s) may be administered thera models of hypersensitivity or allergic reactions are described peutically to achieve therapeutic benefit or prophylactically 30 in Foster, 1995, Allergy 50(21 Suppl):6–9, discussion 34-38 to achieve prophylactic benefit. By therapeutic benefit is and Tumas et al., 2001, J. Allergy Clin. Immunol. 107(6): meant eradication or amelioration of the underlying disorder 1025-1033. Suitable animal models of allergic rhinitis are being treated and/or eradication or amelioration of one or described in Szelenyi et al., 2000, Arzneimittelforschung more of the symptoms associated with the underlying disor 50(11): 1037-42; Kawaguchi et al., 1994, Clin. Exp. Allergy der Such that the patient reports an improvement in feeling or 35 24(3):238-244 and Sugimoto et al., 2000, Immunopharma condition, notwithstanding that the patient may still be cology 48(1):1-7. Suitable animal models of allergic conjunc afflicted with the underlying disorder. For example, adminis tivitis are described in Carreras et al., 1993, Br. J. Ophthal tration of a compound to a patient Suffering from an allergy mol. 77(8):509-514; Saiga et al., 1992, Ophthalmic Res. provides therapeutic benefit not only when the underlying 24(1):45-50; and Kunert et al., 2001, Invest. Ophthalmol. Vis. allergic response is eradicated or ameliorated, but also when 40 Sci. 42(11):2483-2489. Suitable animal models of systemic the patient reports a decrease in the severity or duration of the mastocytosis are described in O'Keefe et al., 1987, J. Vet. symptoms associated with the allergy following exposure to Intern. Med. 1(2):75-80 and Bean-Knudsen et al., 1989, Vet. the allergen. As another example, therapeutic benefit in the Pathol. 26(1):90-92. Suitable animal models of hyper IgE context of asthma includes an improvement in respiration syndrome are described in Claman et al., 1990, Clin. Immu following the onset of an asthmatic attack, or a reduction in 45 nol. Immunopathol. 56(1):46-53. Suitable animal models of the frequency or severity of asthmatic episodes. Therapeutic B-cell lymphoma are described in Hough et al., 1998, Proc. benefit also includes halting or slowing the progression of the Natl. Acad. Sci. USA 95:13853-13858 and Hakim et al., disease, regardless of whether improvement is realized. 1996, J. Immunol. 157(12):5503-5511. Suitable animal mod For prophylactic administration, the compound may be els of atopic disorders such as atopic dermatitis, atopic administered to a patient at risk of developing one of the 50 eczema and atopic asthma are described in Chan et al., 2001, previously described diseases. For example, if it is unknown J. Invest. Dermatol. 117(4):977-983 and Suto et al., 1999, Int. whether a patient is allergic to a particular drug, the com Arch. Allergy Immunol. 120(Suppl 1):70-75. Ordinarily pound may be administered prior to administration of the skilled artisans can routinely adapt Such information to deter drug to avoid or ameliorate an allergic response to the drug. mine dosages suitable for human administration. Additional Alternatively, prophylactic administration may be applied to 55 Suitable animal models are described in the Examples section. avoid the onset of symptoms in a patient diagnosed with the Dosage amounts will typically be in the range of from underlying disorder. For example, a compound may be about 0.0001 or 0.001 or 0.01 mg/kg/day to about 100 mg/kg/ administered to an allergy Sufferer prior to expected exposure day, but may be higher or lower, depending upon, among to the allergen. Compounds may also be administered pro other factors, the activity of the compound, its bioavailability, phylactically to healthy individuals who are repeatedly 60 the mode of administration and various factors discussed exposed to agents known to one of the above-described mala above. Dosage amount and interval may be adjusted individu dies to prevent the onset of the disorder. For example, a ally to provide plasma levels of the compound(s) which are compound may be administered to a healthy individual who is sufficient to maintain therapeutic or prophylactic effect. For repeatedly exposed to an allergen known to induce allergies, example, the compounds may be administered once per such as latex, in an effort to prevent the individual from 65 week, several times per week (e.g., every other day), once per developing an allergy. Alternatively, a compound may be day or multiple times per day, depending upon, among other administered to a patient Suffering from asthma prior to par things, the mode of administration, the specific indication US 8,178,671 B2 75 76 being treated and the judgment of the prescribing physician. The most variable aspect of preparing the CM is the In cases of local administration or selective uptake. Such as method by which the NS is thawed and mixed prior to addi local topical administration, the effective local concentration tion to the SFM. The NS should be thawed in a 37° C. water of active compound(s) may not be related to plasma concen bath and swirled, not vortexed or shaken, until it is completely tration. Skilled artisans will be able to optimize effective local 5 in solution. While swirling, take note whether there are any dosages without undue experimentation. lipids that are not yet in solution. If lipids are present and the Preferably, the compound(s) will provide therapeutic or NS is not uniform in appearance, return it to the water bath prophylactic benefit without causing Substantial toxicity. and repeat the Swirling process until it is uniform in appear Toxicity of the compound(s) may be determined using stan ance. Sometimes this component goes into Solution immedi dard pharmaceutical procedures. The dose ratio between 10 ately, sometimes after a couple of Swirling cycles, and some times not at all. If, after a couple of hours, the NS is still not toxic and therapeutic (or prophylactic) effect is the therapeu in solution, discard it and thaw a fresh unit. NS that appears tic index. Compounds(s) that exhibit high therapeutic indices non-uniform after thaw should not be used. are preferred. 7.2.1.2 Expansion of CD34+ Cells The invention having been described, the following 15 A starting population of CD34-positive (CD34+) cells of examples are offered by way of illustration and not limitation. relatively small number (1-5x10 cells) was expanded to a relatively large number of CD34-negative progenitor cells 7. EXAMPLES (about 2-4x10 cells) using the culture media and methods described below. The CD34+ cells (from a single donor) were 7.1 2.4-Pyrimidinediamine Compounds obtained from Allcells (Berkeley, Calif.). Because there is a degree of variation in the quality and number of CD34+ cells A variety of N4-substituted-N2-monosubstituted-4-pyri that Allcells typically provides, the newly delivered cells midinediamines were prepared based on procedures were transferred to a 15 mL conical tube and brought up to 10 described herein. Such compounds are depicted in Table 1. mL in CM prior to use. 25 On day 0, a cell count was performed on the viable (phase 7.2 The 2.4-Pyrimidinediamine Compounds of the bright) cells and the cells were spun at 1200 rpm to pellet. The Invention Inhibit FceRI Receptor-Mediated cells were resuspended to a density of 275,000 cells/mL with Degranulation CM containing 200 ng/mL recombinant human Stem Cell Factor (“SCF': Peprotech, Catalog No. 300-07) and 20 The ability of the 2.4-pyrimidinediamine compounds of 30 ng/mL human filt-3 ligand (Peprotech, Catalog No. 300-19) the invention to inhibit IgE-induced degranulation was dem (“CM/SCF/fit-3 medium'). On about day 4 or 5, the density onstrated in a variety of cellular assays with cultured human of the culture was checked by performing a cell count and the mast cells (CHMC) and/or mouse bone marrow derived cells culture was diluted to a density of 275,000 cells/mL with (BMMC). Inhibition of degranulation was measured at both fresh CM/SCF/fit-3 medium. On about day 7, the culture was low and high cell density by quantifying the release of the 35 transferred to a sterile tube and a cell count was performed. granule specific factors tryptase, histamine and hexosamini The cells were spun at 1200 rpm and resuspended to a density dase. Inhibition of release and/or synthesis of lipid mediators of 275,000 cells/mL with fresh CM/SCF/filt-3 medium. was assessed by measuring the release of leukotriene LTC4 This cycle was repeated, starting from day 0, a total of 3-5 and inhibition of release and/or synthesis of cytokines was times over the expansion period. monitored by quantifying TNF-C. IL-6 and IL-13. Tryptase 40 When the culture is large and being maintained in multiple and hexosaminidase were quantified using fluorogenic Sub flasks and is to be resuspended, the contents of all of the flasks strates as described in their respective examples. Histamine, are combined into a single container prior to performing a cell TNFO, IL-6, IL-13 and LTC4 were quantified using the fol count. This ensures that an accurate cell count is achieved and lowing commercial ELISA kits: histamine (Immunotech provides for a degree of uniformity of treatment for the entire #2015, Beckman Coulter), TNFC. (Biosource #KHC3011), 45 population. Each flask is checked separately for contamina IL-6 (Biosource #KMC0061), IL-13 (Biosource #KHC0132) tion under the microscope prior to combining to prevent con and LTC4 (Cayman Chemical #520211). The protocols of the tamination of the entire population. various assays are provided below. Between days 17-24, the culture can begin to go into 7.2.1 Culturing of Human Mast and Basophil Cells decline (i.e., approximately 5-10% of the total number of Human mast and basophil cells were cultured from CD34 50 cells die) and fail to expand as rapidly as before. The cells are negative progenitor cells as described below (see also the then monitored on a daily basis during this time, as complete methods described in copending U.S. application Ser. No. failure of the culture can take place in as little as 24 hours. 10/053,355, filed Nov. 8, 2001, the disclosure of which is Once the decline has begun, the cells are counted, spun down incorporated herein by reference). at 850 rpm for 15 minutes, and resuspended at a density of 7.2.1.1 Preparation of STEMPRO-34 Complete Medium 55 350,000 cells/mL in CM/SCF/flt-3 medium to induce one or To prepare STEMPRO-34 complete medium (“CM), 250 two more divisions out of the culture. The cells are monitored mL STEMPRO-34TM serum free medium (“SFM'; Gibco daily to avoid failure of the culture. BRL, Catalog No. 10640) was added to a filter flask. To this When greater than 15% cell death is evident in the progeni was added 13 mL STEMPRO-34 Nutrient Supplement tor cell culture and some debris is present in the culture, the (“NS: GibcoBRL, Catalog No. 10641) (prepared as 60 CD34-negative progenitor cells are ready to be differentiated. described in more detail, below). The NS container was 7.2.1.3 Differentiation of CD34-Negative Progenitor Cells rinsed with approximately 10 mL SFM and the rinse added to into Mucosal Mast Cells the filter flask. Following addition of 5 mL L-glutamine (200 A second phase is performed to convert the expanded mM: Mediatech, Catalog No. MT 25-005-CI and 5 mL 100x CD34-negative progenitor cells into differentiated mucosal penicillin/streptomycin (“pen-strep': HyClone, Catalog No. 65 mast cells. These mucosal cultured human mast cells SV30010), the volume was brought to 500 mL with SFM and (“CHMC) are derived from CD34+ cells isolated from the solution was filtered. umbilical cord blood and treated to form a proliferated popu US 8,178,671 B2 77 78 lation of CD34-negative progenitor cells, as described above. un-stimulated control wells. Mix twice following addition of To produce the CD43-negative progenitor cells, the resuspen the anti-IgE. Incubate at 37°C. for 30 minutes. During the 30 sion cycle for the culture was the same as that described minute incubation, dilute the 20 mM tryptase substrate stock above, except that the culture was seeded at a density of solution (Z-Ala-Lys-Arg-AMC2TFA: Enzyme Systems 425,000 cells/mL and 15% additional media was added on 5 Products, HAMC-246) 1:2000 in tryptase assay buffer 0.1M about day four or five without performing a cell count. Also, Hepes (pH 7.5), 10% w/v Glycerol, 10 uM Heparin (Sigma the cytokine composition of the medium was modified Such H-4898) 0.01% NaNs). Spin plates at 1000 rpm for 10 minto that it contained SCF (200 ng/mL) and recombinant human pellet cells. Transfer 25ul of supernatant to a 96-well black IL-6 (200 ng/mL: Peprotech, Catalog No. 200-06 reconsti bottom plate and add 100 ul of freshly diluted tryptase sub tuted to 100 ug/mL in sterile 10 mMacetic acid) (“CM/SCF/ 10 IL-6 medium'). strate Solution to each well. Incubate plates at room tempera Phases I and II together span approximately 5 weeks. Some ture for 30 min. Read the optical density of the plates at 355 death and debris in the culture is evident during weeks 1-3 and nm/460 nm on a spectrophotometric plate reader. there is a period during weeks 2-5 during which a small Leukotriene C4 (LTC4) is also quantified using an ELISA percentage of the culture is no longer in Suspension, but is 15 kit on appropriately diluted Supernatant samples (determined instead attached to the surface of the culture vessel. empirically for each donor cell population so that the sample As during Phase I, when the culture is to be resuspended on measurement falls within the standard curve) following the day seven of each cycle, the contents of all flasks are com Supplier's instructions. bined into a single container prior to performing a cell count 7.2.3 CHMC High Cell Density IgE Activation: Degranu to ensure uniformity of the entire population. Each flask is lation (Tryptase, Histamine), Leukotriene (LTC4), and checked separately for contamination under the microscope Cytokine (TNFalpha, IL-13) Assays prior to combining to prevent contamination of the entire Cultured human mast cells (CHMC) are sensitized for 5 population. days with IL-4 (20 ng/ml), SCF (200 ng/ml), IL-6 (200 When the flasks are combined, approximately 75% of the ng/ml), and Human IgE (CP 1035K from CortX Biochem, Volume is transferred to the communal container, leaving 25 100-500 ng/ml depending on generation) in CM medium. behind about 10 mL or so in the flask. The flask containing the After sensitizing, cells are counted, pelleted (1000 rpm, 5-10 remaining Volume was rapped sharply and laterally to dis minutes), and resuspended at 1-2x10 cells/ml in MT buffer. lodge the attached cells. The rapping was repeated at a right Add 100 ul of cell suspension to each well and 100 ul of angle to the first rap to completely dislodge the cells. compound dilutions. The final vehicle concentration is 0.5% The flask was leaned at a 45 degree angle for a couple of 30 minutes before the remaining volume was transferred to the DMSO. Incubate at 37° C. (5% CO) for 1 hour. After 1 hour counting vessel. The cells were spun at 950 rpm for 15 min of compound treatment, stimulate cells with 6x anti-IgE. Mix prior to seeding at 35-50 mL per flask (at a density of 425,000 wells with the cells and allow plates to incubate at 37°C. (5% cells/mL). CO) for one hour. After 1 hour incubation, pellet cells (10 7.2.1.4 Differentiation of CD34-Negative Progenitor Cells 35 minutes, 1000 RPM) and collect 200ul per well of the super into Connective Tissue-Type Mast Cells natant, being careful not to disturb pellet. Place the superna A proliferated population of CD34-negative progenitor tant plate on ice. During the 7-hour step (see next) perform cells is prepared as above and treated to form a tryptase/ tryptase assay on supernatant that had been diluted 1:500. chymase positive (connective tissue) phenotype. The meth Resuspend cell pellet in 240 ul of CM media containing 0.5% ods are performed as described above for mucosal mast cells, 40 DMSO and corresponding concentration of compound. Incu but with the substitution of IL-4 for IL-6 in the culture bate CHMC cells for 7 hours at 37° C. (5% CO). After medium. The cells obtained are typical of connective tissue incubation, pellet cells (1000 RPM, 10 minutes) and collect mast cells. 225 ul per well and place in -80° C. until ready to perform 7.2.1.5 Differentiation of CD34-Negative Progenitor Cells ELISAS. ELISAS are performed on appropriately diluted into Basophil Cells 45 samples (determined empirically for each donor cell popula A proliferated population of CD34-negative progenitor tion so that the sample measurement falls within the standard cells is prepared as described in Section 7.2.1.3, above, and curve) following the Supplier's instructions. used to form a proliferated population of basophil cells. The 7.2.4 Results CD34-negative cells are treated as described for mucosal The results of low density CHMC assays are provided in mast cells, but with the substitution of IL-3 (at 20-50 ng/mL) 50 Table 1. In Table 1, all reported values are ICsos (inuM). Most for IL-6 in the culture medium. compounds tested had ICsos of less than 10 LM, with many 7.2.2 CHMC Low Cell Density IgE Activation: Tryptase exhibiting ICsos in the sub-micromolar range. In Table 1, all and LTC4 Assays reported values are ICsos (in LM). A value of '-' indicates an To duplicate 96-well U-bottom plates (Costar 3799) add 65 ICs >10 uM, with no measurable activity at a 10 uM concen ul of compound dilutions or control samples that have been 55 tration. Most compounds tested had ICss of less than 10 M. prepared in MT137 mMNaCl, 2.7 mMKC1, 1.8 mM CaCl, with many exhibiting ICsos in the Sub-micromolar range. A 1.0 mM MgCl, 5.6 mM Glucose, 20 mM Hepes (pH 7.4), value of "+" indicates an ICs-10 uM. Of the compounds 0.1% Bovine Serum Albumin, (Sigma A4503) containing tested, BMMC values are comparable to those noted for the 2% MeOH and 1% DMSO. Pellet CHMC cells (980 rpm, 10 CHMC results. min) and resuspend in pre-warmed MT. Add 65ul of cells to 60 each 96-well plate. Depending on the degranulation activity 7.3 The 2.4-Pyrimidinediamine Compounds of the for each particular CHMC donor, load 1000-1500 cells/well. Invention Selectively Inhibit the Upstream IgE Mix four times followed by a 1 hr incubation at 37°C. During Receptor Cascade the 1 hr incubation, prepare 6x anti-IgE solution rabbit anti human IgE (1 mg/ml, Bethyl Laboratories A80-109A) diluted 65 To confirm that many of the 2.4-pyrimidinediamine com 1:167 in MT buffer. Stimulate cells by adding 25 ul of 6x pounds of the invention exert their inhibitory activity by anti-IgE solution to the appropriate plates. Add 25 ul MT to blocking or inhibiting the early IgE receptor signal transduc US 8,178,671 B2 79 80 tion cascade, several of the compounds were tested in cellular ment, Compounds were diluted to 1% DMSO in kinase buffer assays for ionomycin-induced degranulation, as described (20 mM HEPES, pH 7.4, 5 mM MgCl, 2 mM MnC1, 1 mM below. DTT, 0.1 mg/mL acetylated Bovine Gamma Globulin). Com 7.3.1 CHMC Low Cell Density Ionomycin Activation: pound in 1% DMSO (0.2% DMSO final) was mixed with Tryptase Assay 5 ATP/substrate solution at room temperature. Syk kinase (Up Assays for ionomycin-induced mast cell degranulation state, Lake Placid N.Y.) was added to a final reaction volume were carried out as described for the CHMC Low Density IgE of 20 uL, and the reaction was incubated for 30 minutes at R RISCR 2. p with the sets, room temperature. Final enzyme reaction conditions were 20 that uring t e 1 nour incu ation, x 10nomyc1n so ution mM HEPES, pH 7.4, 5 mM MgCl, 2 mM MnC1, 1 mM mM ionomycin (Sigma I-0634) in MeCH (stock) diluted 10 DTT, 0.1 mg/mL acetylated Bovine Gamma Globulin, 0.125 1:416.7 in MT buffer (2 uM final) was prepared and cells k ide sub bioti were stimulated by adding 25ul of the 6x ionomycin solution ng Syk, 4 uM ATP 2.5uM peptide substrate (biotin-EQEDE to the appropriate plates. PEGDYEEVLE-CONH2, SynPep Corporation). EDTA (10 7.3.2 Results mM final)'anti-phosphotyrosine antibody (1x final) fluores The results of the ionomycin-induced degranulation 15 cent phosphopeptide tracer (0.5 x final) was added in FP Dilu assays, reported as ICso values (in LM) are provided in Table t1On Buffer to stop the reaction for a total volume of 40 uL 1. Of the active compounds tested (i.e., those that inhibit according to manufacturer S instructions (Panvera Corpora IgE-induced degranulation), the vast majority do not inhibit tion) The plate was incubated for 30 minutes in the dark at ionomycin-induced degranulation, confirming that these room temperature. Plates were read on a Polarion fluores active compounds selectively inhibit the early (or upstream) 20 cence polarization plate reader (Tecan). Data Were converted IgE receptor signal transduction cascade. In Table 1, all to amount of phosphopeptide present using a calibration reported values are ICsos (inuM). A value of “-” indicates an curve generated by competition with the phosphopeptide ICs >10 uM, with no measurable activity at a 10 uM concen- competitor provided in the Tyrosine Kinase Assay Kit, Green tration. A value of"+” indicates an ICso~10 uM. (PanVera Corporation). 25 These data, shown in Table 1, demonstrate that most all of 7.42.4-Pyrimidinediamine Compounds Inhibit Syk the compounds tested, inhibit Syk kinase phosphorylation Kinase in Biochemical Assays with ICsos in the Submicromolar range. A vast majority of the compounds tested inhibit Syk kinase phosphorylation with Many of the 2.4-pyrimidinediamine compounds were ICsos in the micromolar range. In Table 1, all reported values tested for the ability to inhibit Syk kinase catalyzed phospho- 30 are ICsos (in uM). A value of "-" indicates an ICs >10 uM, rylation of a peptide substrate in a biochemical fluorescenced with no measurable activity at a 10M concentration. A value polarization assay with isolated Syk kinase. In this experi- of "+" indicates an ICsog10 uM.

LD LD LD Tryp- Tryp- Tryp Com- tase, tase, tase, pound CHMC, CHMC, CHMC, Num- IgE, IgE, Iono, fip Syk, ber Compound Name Physical Data 3pt 8pt 3pt 11pt 200 (S)-5-Fluoro-N2-(indazol-6-yl)-N4-(2-methyl- H NMR(DMSO-d6): d 8.08(d. 1H), 7.95 (s, 1H), 7.58(d, -- 3-oxo-2H4H-benz14loxazin-6-yl)-2,4- 1H), 7.40(m, 1H), 7.25(m,3H), 6.94(m, 1H), 4.80(m, pyrimidinediamine 1H), 1.40(s, 3H); LCMS: purity: 96%: MS(me): 406 (MH+). 201 (S)-5-Fluoro-N2-(1-methylindazol-6-yl)-N4- "H NMR(DMSO-d6): d 8.17(d. 1H), 8.08(s, 1H), 7.80(s, -- (2-methyl-3-oxo-2H4H-benz14oxazin-6- 1H), 7.52(m, 1H), 7.32(m, 1H), 7.17 (m, 2H), 6.94(m, yl)-2,4-pyrimidinediamine 1H), 4.60(m, 1H), 3.77(s, 3H), 1.45(s, 3H); LCMS: purity: 94%; MS (mi?e): 420 (MH+). 202 (S)-N2-(3,5-Dimethylphenyl)-5-fluoro-N4-(2- H NMR(DMSO-d6): d 8.01(d. 1H), 7.28(m, 2H), 7.20(s, -- methyl-3-oxo-2H4H-benz14oxazin-6-yl)- 2H), 6.95 (m, 1H), 6.58(s, 1H), 4.63 (m, 1H), 3.77(s, 3H), 2.4-pyrimidinediamine 2.07 (s, 6H), 1.42(d. 3H); LCMS: purity: 92%; MS(m/e): 393 (MH+). 203 N4-(3,4-Dihydro-3,3-dimethyl-2H4H- H NMR(DMSO-d6): d 8.02(d. 1H), 6.98 (m, 2H), -- -- benz14oxazin-6-yl)-N2-(3,5- 6.90 (m, 2H), 6.80(m, 1H), 6.03(s, 1H), 3.72(s, 2H), dimethoxyphenyl)-5-fluoro-2,4- 3.60(s, 6H), 1.05(s, 6H); LCMS: purity: 96%; MS(m/e): pyrimidinediamine 425 (MH+). 204 (R)-N2-(3,5-Dimethylphenyl)-5-fluoro-N4-(2- H NMR(DMSO-d6): d 8.01(d. 1H), 7.28(m, 2H), 7.20(s, -- methyl-3-oxo-2H4H-benz14oxazin-6-yl)- 2H), 6.95 (m, 1H), 6.58(s, 1H), 4.63 (m, 1H), 3.77(s, 3H), 2.4-pyrimidinediamine 2.07 (s, 6H), 1.42(d. 3H); LCMS: purity: 92%; MS(m/e): 393 (MH+). 205 (R)-5-Fluoro-N2-6-(2-hydroxyethyl)-2,3- H NMR(MeOD-d4): d 7.75 (d. 1H), 7.38(m, 1H), -- dihydropyrrolo1,2,3-debenzoxazin-8-yl)- 7.02(m, 3H), 6.78(m, 2H), 4.54(m, 1H), 4.4(m, 2H), N4-(2-methyl-3-oxo-2H4H-benz1,4-oxazin- 4.14(m, 2H), 3.62(m, 2H), 3.62(m, 2H), 2.80(m, 2H), 6-yl)-2,4-pyrimidinediamine 1.41 (d. 3H); LCMS: purity: 93%; MS(m/e): 491 (MH+). 206 N4-(3,4-Dihydro-3,3-dimethyl-2H4H- "H NMR(MeOD-d4): d 7.62(d. 1H), 7.04(s, 1H), 6.98(m, -- benz14oxazin-6-yl)-5-fluoro-N2-6-(2- 2H), 6.75 (m, 1H), 6.59(m, 2H), 4.47 (m, 1H), 4.4(m, 2H), hydroxyethyl)-2,3-dihydropyrrolo.1,2,3- 4.14(m, 2H), 3.62(m, 4H), 2.80(m, 2H), 1.07 (s, 6H); debenzoxazin-8-yl)-2,4-pyrimidinediamine LCMS: purity: 98%; MS(mfe): 491 (MH--). 207 (R)-N2-(3-Chloro-4-methoxyphenyl)-5- H NMR(MeOD-d4): d 7.98(d. 1H), 7.82(m, 2H), 7.48(s, -- fluoro-N4-(2-methyl-3-oxo-2H4H- 1H), 7.41 (m, 3H), 7.25(dd, 1H), 7.15(m, 3H), 6.94(d, benz14oxazin-6-yl)-2,4-pyrimidinediamine 1H), 4.62(q, 1H), 3.82(s, 3H), 1.50(d,3H); LCMS: Benzene Sulfonic Acid Salt