Anti-Viral Nucleoside Analogs and Methods for Treating Viral Infections, Especially Hiv Infections
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(19) & (11) EP 2 298 783 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 23.03.2011 Bulletin 2011/12 C07H 19/10 (2006.01) A61K 31/7068 (2006.01) A61P 31/18 (2006.01) (21) Application number: 10155533.2 (22) Date of filing: 18.02.2004 (84) Designated Contracting States: (72) Inventors: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR • Cheng, Yung-Chi HU IE IT LI LU MC NL PT RO SE SI SK TR WOODBRIDGE, CT 06525 (US) Designated Extension States: • Tanaka, Hiromichi AL LT LV MK YOKOHAMA 224-0028 (JP) • Baba, Masanori (30) Priority: 19.03.2003 US 448554 KAGOSHIMA Fukuoka 891-0103 (JP) (62) Document number(s) of the earlier application(s) in (74) Representative: Dall’Olio, Giancarlo et al accordance with Art. 76 EPC: Invention S.r.l. 04775776.0 / 1 653 976 Via delle Armi 1 40137 Bologna (IT) (71) Applicants: • Yale University Remarks: New Haven, CT 06511 (US) This application was filed on 04-03-2010 as a • Cheng, Yung-Chi divisional application to the application mentioned Woodbridge, CT 06525 (US) under INID code 62. • Tanaka, Hiromichi Yokohama 224-0028 (JP) (54) Anti-viral nucleoside analogs and methods for treating viral infections, especially hiv infections (57) The present invention relates to novel com- n-C≡C-Ra, Formula (XII) or Formula (XIII) with the pro- pounds according to the general Formulae (I, II, III, IV or viso that R4 and R5 are not both H; Ra is H,F,Cl,Br,I or V); wherein B is nucleoside base according to the struc- -C1-C4 alkyl, preferably H or CH3; Y is H, F, C1, Br, I or ture Formula (VI); R is H, F, Cl, Br, I, C1-C4 alkyl (pref- -C1-C4 alkyl, preferably H or CH3; and n is 0,1,2,3,4 or erably CH3), -C≡N, -C≡C-Ra, Formula (VII); X is H, C 1-C4 5, preferably 0, 1 or 2; and their anomers, pharmaceuti- alkyl (preferably CH 3), F,Cl,Br or 1; Z is 0 or CH 2 with the cally acceptable salts, solvates or polymorphs thereof. proviso that Z is CH2 and not O when the compound is according to general formula II, R3 is -C≡C-H and R2 is H or a phosphate, diphosphate, triphosphate or phos- 1 photriester group; R is H, an acyl group, a C 1-C20 alkyl or an ether group; R2 is H, an acyl group, a CI- C20 alkyl or ether group, a phosphate, diphosphate, triphosphate, phosphodiester group or a Formula; (VIII) or Formula (IX) group; Nu is a radical of a biologically active antiviral com- pound such that an amino group or hydroxyl group from said biologically active antiviral compound forms a phos- phate, phosphoramidate, carbonate or urethane group with the adjacent moiety; R8 is H, or a C1-C20 alkyl or ether group, preferably a C1-C12 alkyl group; k is 0-12, preferably, 0-2; R3 is selected from a C1-C4 alkyl (pref- erably CH3), -(CH2)n-C=C-Ra, Formula (X) or Formula (XI); R3a and R3b are independently selected from H, F, C1, Br or I; R4 and R5 are independently selected from H, F, Cl, Br, I, OH, C1-C4 alkyl (preferably CH3),-(CH2) EP 2 298 783 A1 Printed by Jouve, 75001 PARIS (FR) EP 2 298 783 A1 Description Related Applications 5 [0001] This application claims the benefit of provisional application number 60/448,554, filed February 19, 2003, the entirety of which is incorporated by reference herein. Field of the Invention 10 [0002] The present invention relates to novel 2’,3’-dideoxy and didehydro nucleoside analogs and related prodrugs and their use in the treatment of a number of viral infections and disease states, especially including HIV and its related condition AIDS, among numerous others, and in particular, retroviruses. [0003] This work was supported by Public Health Service grant AI-38204 from the National Institutes of Health. The government retains certain rights in the invention. 15 Background of the invention [0004] Human immunodeficiency virus (HIV/AIDS) has become the leading infectious cause of death worldwide sur- passing malaria and tuberculosis. WHO AIDS Epidemic Update, data for December 2002, lists 3.1 million deaths and 20 42 million people currently living with AIDS. The need for new therapeutic agents with better efficacy is evident. Dideoxy nucleosides are an important group of antiviral compounds(16, 26, 27). A member of this group, 3’-Azido-3’-deoxythy- midine (AZT, Retovir, Zidovudine) was the first drug approved for the treatment of HIV. Its dose limiting adverse effect is myelosuppression (14, 36, 39), which may be worsened by the concurrent administration of other drugs that cause bone marrow suppression or that are hepatically metabolized. 2’, 3’- Didehydro-3’-deoxythymidine (D4T, Stavudine, 25 Zerit) was then approved because of better bioavailability and lower acute toxicity (1). D4T is limited by a long-term delayed toxicity, peripheral sensory neuropathy (4) which is related to mitochondrial damage (3, 5, 6, 13, 18, 22, 30, 33, 34). 2’, 3’-Dideoxyinosine (ddI, Didanosine, Videx) and 2’, 3’-dideoxycytidine (ddC, Zalcitabine) are dideoxynucleoside anti HIV compounds that also have peripheral neuropathy as their leading adverse effect. In the search to find anti- HIV nucleoside analogs that had less neuropathy, many classes of compounds were synthesized and assessed for their 30 antiviral activity and cytotoxicity including their impact on mitochondrial DNA. Dideoxynucleosides in the unnatural L conformation represented by β-L-2’, 3’-dideoxy-3’- thiacytidine (3TC, Lamivudine), its 5- fluoro analog (FTC, Emtricitab- ine) and β-L-2’, 3’-dideoxy-2’,3’-didehydro-5- fluorocytidine (LFd4C, Elvucitabine), have been shown by us (2, 11, 12, 23-25) and others (8, 9, 15, 37) to have good antiviral activity and low mitochondrial toxicity. However, even with com- pounds relatively non-toxic to mitochondria there is a lack of a durable response. This condition can be caused by either 35 the rapid emergence of resistant virus or by host changes that cause differences in drug metabolism (10, 19, 35). [0005] One approach to combat this problem is to develop compounds with less toxicity and lack of cross- resistance to other antiviral drugs. When used in combinations these compounds may decrease the dosage of existing drugs needed to achieve the same antiviral effect with less toxicity. Futhermore, these compounds could even delay the onset of resistance, which could be based on the decreased viral load during treatment. In the search for a new antiviral 40 compounds, others have looked at 4’-substituted dThd analogs (29) (32), while we synthesized a series of 4’- substituted D4T analogs. Screening revealed the 4’-ethynyl D4T to be the most active among those tested (17). In the studies described within we describe the structure activity relationship of this class of compounds and characterize 4’-ethynyl D4T in more detail with respect to its mode of action against HIV and its interaction with key cellular enzymes that mediate its activity. 45 Objects of the Invention [0006] It is an object of the invention to provide compounds for the treatment of viral infections or cancer. [0007] It is another object of the invention to provide pharmaceutical compositions which can be used to treat viral 50 infections or cancer. [0008] It is an additional object to provide compounds and pharmaceutical compositions which can be used in com- bination therapy with known anti-viral agents. [0009] It is still a further object of the present invention to provide prodrug forms of compounds according to the present invention which are formulated in combination with other anti-viral agents. 55 [0010] It is another object of the invention to provide therapeutic methods for the treatment of a variety of viruses as otherwise described herein, or cancer. [0011] It is yet another obj ect of the invention to provide methods of synthesizing compounds according to the present invention. 2 EP 2 298 783 A1 [0012] These and/or other objects of the invention may be readily gleaned from the description of the invention which follows. Brief Description of the Figures 5 [0013] Figure 1 depicts a number of preferred compounds according to the present invention. Figure 2 depicts anti- HIV compounds L(-)Fd4C, L(-)SddC, ddC and D4T that are not object of the present invention. 10 Figure 3 depicts preferred dinucleoside compounds according to the present invention. Figure 4 shows the chemical synthesis of TDK-4-152 in Scheme A that are not object of the present invention. Figure 5 shows the chemical synthesis of TDK-4-114 in Scheme B. Figure 5A shows an alternative chemical synthesis of TDK4-114 . Figure 5B shows an alternative preparation of acyloxynucleoside compound intermediates accordingto the invention, 15 which may be used to produced TKD-4-114 of Figure 5A. Figure 6 shows a chemical synthesis of KMA-23-153 that is not object of the present invention. Figure 7A shows the synthesis of 4’ethynyl-2’-deoxynucleosides from 2’-deoxynucleosides according to the meth- odology of Nomura, et al. J. Med. Chem., 42, 2901-2908 (1999) that is not object of the present invention. Note that SiR3 is a tert-butyldimethylsilyl group and SiR’3 is a tert-butyldiphenylsilyl group. X is a halogen atom, such as 20 chlorine and B is a nucleoside base such as uracil, adenine, guanine or cytosine, among others. Figure 7B shows the synthesis of 4’-ethynyl-2’-deoxynucleosides from a blocked sugar precursor according to the methodology of Ohrui, et al., J. Med.