WO 2014/117274 Al 7 August 2014 (07.08.2014) P O P C T
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(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2014/117274 Al 7 August 2014 (07.08.2014) P O P C T (51) International Patent Classification: (81) Designated States (unless otherwise indicated, for every C07D 471/04 (2006.01) A61K 31/5377 (2006.01) kind of national protection available): AE, AG, AL, AM, A61K 31/437 (2006.01) A61K 31/4025 (2006.01) AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, A61K 31/4545 (2006.01) A61P 29/00 (2006.01) BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, (21) International Application Number: HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, PCT/CA20 14/050062 KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, (22) International Filing Date: MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, 3 1 January 2014 (3 1.01 .2014) OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, (25) Filing Language: English TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, (26) Publication Language: English ZW. (30) Priority Data: (84) Designated States (unless otherwise indicated, for every 61/759,123 31 January 2013 (3 1.01.2013) US kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, (71) Applicant: NEOMED INSTITUTE [CA/CA]; 7171 Fred UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, erick-Banting, Montreal, Quebec H4S 1Z9 (CA). TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, (72) Inventors: BUON, Christophe; 7171 Frederick-Banting, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, Montreal, Quebec H4S 1Z9 (CA). CANTIN, Louis-David; TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, 7171 Frederick-Banting, Montreal, Quebec H4S 1Z9 (CA). KM, ML, MR, NE, SN, TD, TG). HU, Yun-Jin; 7171 Frederick-Banting, Montreal, Quebec H4S 1Z9 (CA). LUO, Xuehong; 7171 Frederick-Banting, Published: Montreal, Quebec H4S 1Z9 (CA). TOMASZEWSKI, — with international search report (Art. 21(3)) Miroslaw Jerzy; 7 17 1 Frederick-Banting, Montreal, Quebec H4S 1Z9 (CA). (74) Agent: ROBIC LLP; Centre CDP Capital, Bloc E - 8th Floor, 1001 Square-Victoria, Montreal, Quebec H2Z 2B7 (CA). (54) Title: IMIDAZOPYRIDINE COMPOUNDS AND USES THEREOF (57) Abstract: This invention generally relates to substituted imidazopyridine compounds, particularly substituted 4-(imidazo[l,2- a]pyridin-2-yl)benzamide compounds and salts thereof. This invention also relates to pharmaceutical compositions and kits compris - ing such a compound, uses of such a compound (including, for example, treatment methods and medicament preparations), pro - cesses for making such a compound, and intermediates used in such processes. IMIDAZOPYRIDINE COMPOUNDS AND USES THEREOF FIELD OF THE INVENTION [1] This invention generally relates to substituted imidazopyridine compounds, particularly substituted 4-(imidazo[l,2-a]pyridin-2-yl)benzamide compounds and salts thereof. This invention also relates to pharmaceutical compositions and kits comprising such a compound, uses of such a compound (including, for example, treatment methods and medicament preparations), processes for making such a compound, and intermediates used in such processes. BACKGROUND [2] P2X purinoreceptors are a family of ion channels that are activated by extracellular adenosine triphosphate (ATP). Purinoreceptors have been implicated in a variety of biological functions, especially those related to pain sensitivity. The P2X3 receptor subunit is a member of this family. It was originally cloned from rat dorsal root ganglia. Chen et al., Nature, vol. 377, pp. 428-431 (1995). The nucleotide and amino acid sequences of both rat and human P2X3 are now known. Lewis, et al., Nature, vol. 377, pp. 432-435 (1995); and Garcia-Guzman, et al, Brain Res. Mol. Brain Res., vol. 47, pp. 59-66 (1997). [3] P2X3 is reportedly involved in afferent pathways controlling urinary bladder volume reflexes. Consequently, inhibiting P2X3 may have therapeutic potential for treating disorders of urine storage and voiding, such as overactive bladder. Cockayne, et al, Nature, vol. 407, pp. 1011-1015 (2000). [4] P2X3 also is selectively expressed on nociceptive, small diameter sensory neurons (i.e., neurons that are stimulated by pain or injury), which is consistent with a role in pain sensitivity. And blocking P2X3 receptors has been reported to be analgesic in animal models of chronic inflammatory and neuropathic pain. Jarvis, et al, PNAS, 99, 17179-17184 (2002). It is, therefore, believed that a method for reducing the P2X3 level or activity would be useful for modulating pain sensation in a subject suffering from pain. [5] Various other disorders also have been discussed as being treatable using compounds having P2X3 activity. See, e.g., WO2008/1 36756. [6] P2X3 also is capable of forming P2X2/3 heterodimers with P2X2, which is another member of the P2X purinergic ligand-gated ion channel family. P2X2/3 is highly expressed on the terminals (central and peripheral) of sensory neurons. Chen, et al., Nature, vol. 377, pp. 428-431 (1995). Results from recent studies also suggest that P2X2/3 is predominantly expressed (over P2X3) in bladder sensory neurons, and are likely to play a role in sensing of urinary bladder filling and nociception. Zhong, et al, Neuroscience, vol. 120, pp. 667-675 (2003). [7] In view of the foregoing, there is a need for new P2X3 and/or P2X2/3 receptor ligands, particularly antagonists, that may be useful and safe for treating various disorders related to P2X3 and/or P2X2/3. SUMMARY OF THE INVENTION [8] This invention comprises, inter alia, imidazopyridine compounds; treatment methods using the imidazopyridine compounds (e.g., use of the imidazopyridine to treat various disorders and as pharmacological tools); use of the imidazopyridine compounds to make medicaments; compositions comprising the imidazopyridine compounds (e.g., pharmaceutical compositions); methods for manufacturing the imidazopyridine compounds; and intermediates used in such manufacturing methods. [9] Briefly, this invention is directed, in part, to a compound of Formula I or a salt thereof. Formula I corresponds to: [10] R1 is selected from the group consisting of cyano, halogen, methyl, and ethyl. [11] R2 is selected from the group consisting of hydrogen, halogen, methyl, and ethyl. [12] R is selected from the group consisting of halogen, methyl, and ethyl. [13] R4 is selected from the group consisting of hydrogen, halogen, methyl, ethyl, and methoxy. [14] R and R are independently selected from the group consisting of hydrogen, Ci-C6-alkyl, and hydroxy-Ci-C6-alkyl. Altematively, R5 and R6, together with the nitrogen to which they are both attached, form a 5- or 6-member heterocycloalkyl. The heterocycloalkyl is optionally substituted with one or more substituents independently selected from the group consisting of halogen, hydroxyl, and Ci-C4-alkyl. [15] R7 and R8 are independently selected from the group consisting of hydrogen and Ci-C4-alkyl. [16] R9 is selected from the group consisting of Ci-C -alkyl, C 3-C -cycloalkyl, Ci-C6-alkyl-C3-C6-cycloalkyl, halo-Ci-C6-alkyl, Ci-C6-alkoxy, halo-Ci-C6-alkoxy, and Ci- Ce-alkoxy-Ci-Ce-alkyl. [17] X is selected from a bond, CH2, and O. [18] This invention also is directed, in part, to a pharmaceutical composition that comprises a compound of Formula I or pharmaceutically acceptable salt thereof. In general, the composition also comprises at least one pharmaceutically acceptable inert ingredient. Such inert ingredients are sometimes collectively identified in this patent as "carriers, diluents, or excipients." The composition may further comprise one or more additional active ingredients. For example, such a composition may comprise one or more additional compounds of Formula I and/or salts thereof. The composition also may, for example, altematively or additionally comprise one or more active ingredients other than a compound of Formula I or salt thereof. [19] This invention also is directed, in part, to a compound of Formula I or a pharmaceutically acceptable salt thereof for use as a medicament. [20] This invention also is directed, in part, to a kit comprising a compound of Formula I or a pharmaceutically acceptable salt thereof. [21] This invention also is directed, in part, to the use of a compound of Formula I or a pharmaceutically acceptable salt thereof for manufacturing a pharmaceutical composition (or "medicament"). In general, the composition also comprises at least one pharmaceutically acceptable carrier, diluent, or excipient. Such a composition may further comprise one or more additional active ingredients. For example, such a composition may comprise one or more additional compounds of Formula I and/or pharmaceutically acceptable salts thereof. The composition also may, for example, altematively or additionally comprise one or more active ingredients other than a compound of Formula I or salt thereof. [22] In some embodiments, the medicament is useful for treating a condition associated with P2X3 activity (particularly excessive activity) in an animal (e.g., a human). [23] In some embodiments, the medicament is useful for treating a condition associated with P2X2/3 activity (particularly excessive activity) in an animal (e.g., a human). [24] In some embodiments, the medicament is useful for treating pain in an animal (e.g., a human). [25] In some embodiments, the medicament is useful for treating a urinary tract disorder in an animal (e.g. , a human). [26] This invention also is directed, in part, to methods for treating a disorder in an animal (e.g., a human) in need of such treatment.