Imidazopyridines and imidazopyrazines as LSD1 inhibitors

• US 10,047,086 B2
• Filed: 05/31/2017
• Issued: 08/14/2018
• Est. Priority Date: 07/10/2014
• Status: Active Grant

• Current Assignee: Incyte Corporation, Incyte Holdings Corporation (Incyte Corporation)
• Original Assignee: Incyte Corporation
• Inventors: Wu, Liangxing, Konkol, Leah C., Lajkiewicz, Neil, Lu, Liang, Xu, Meizhong, Yao, Wenqing, Yu, Zhiyong, Zhang, Colin, He, Chunhong
• Primary Examiner(s): Willis, Douglas M
• Application Number:
  US15/610,015
• Publication Number:
  US 20170369487A1
• Time in Patent Office: 440 Days
• Field of Search: 544349, 546121
• CPC Class Codes: A61P 35/00 Antineoplastic agents
• CPC Class Codes: C07D 471/04 Ortho-condensed systems
• CPC Class Codes: C07D 487/04 Ortho-condensed systems
• CPC Class Codes: C07D 519/00 Heterocyclic compounds containing more than one system of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring system not provided for in groups C07D453/00 or C07D455/00

Abstract

The present invention is directed to imidazo[1,5-a]pyridine and imidazo[1,5-a]pyrazine derivatives of Formula I, or a pharmaceutically acceptable salt thereof, which are LSD1 inhibitors useful in the treatment of diseases such as cancer.

Claims

1. A method of inhibiting lysine specific demethylase-1 activity in a patient, comprising administering to the patient a therapeutically effective amount of a compound of Formula I:

2. The method of claim 1, wherein the patient has cancer.

3. The method of claim 2, wherein the cancer is a sarcoma, lung cancer, gastrointestinal cancer, genitourinary tract cancer, liver cancer, bone cancer, nervous system cancer, gynecological cancer, or skin cancer.

4. The method of claim 2, wherein the cancer is a hematological cancer.

5. The method of claim 4, wherein the hematological cancer is selected from acute lymphoblastic leukemia, acute myelogenous leukemia, acute promyelocytic leukemia, chronic lymphocytic leukemia, chronic myelogenous leukemia, diffuse large B-cell lymphoma, mantle cell lymphoma, non-Hodgkin lymphoma, Hodgkin lymphoma, primary myelofibrosis, polycythemia vera, essential thrombocytosis, myelodysplasia syndrome, and multiple myeloma.

6. The method of claim 1, wherein:

Ring A is C_6-10 aryl optionally substituted by 1, 2, 3, or 4 substituents independently selected from R^A;

R¹ is OR^a1 or Cy¹;

R³ is H;

R⁴ is H;

each R^A is independently selected from halo, C_1-6 alkyl, C_2-6 alkenyl, C_2-6 alkynyl, C_1-6 haloalkyl, CN, NO₂, OR^a4, C(O)R^b4, C(O)NR^c4R^d4, C(O)OR^a4, NR^c4R^d4, NR^c4C(O)R^b4, S(O)R^b4, S(O)NR^c4R^d4, S(O)₂R^b4, and S(O)₂NR^c4R^d4, wherein said C_1-6 alkyl, C_2-6 alkenyl, and C_2-6 alkynyl are each optionally substituted by 1, 2, or 3, substituents independently selected from halo, C_1-6 haloalkyl, CN, NO₂, OR^a4, C(O)R^b4, C(O)NR^c4R^d4, C(O)OR^a4, NR^c4R^d4, NR^c4C(O)R^b4, S(O)R^b4, S(O)NR^c4R^d4, S(O)₂R^b4, and S(O)₂NR^c4R^d4;

R^X is H;

each R^a1 is independently selected from C_1-6 alkyl optionally substituted with 1, 2, or 3 substituents independently selected from Cy⁵; and

each R^e5, R^e6, and R^e8 is independently selected from H, C_1-4 alkyl, and CN.

7. The method of claim 1, wherein:

Ring A is C_6-10 aryl optionally substituted by 1, 2, 3, or 4 substituents independently selected from R^A;

R¹ is OR^a1;

R³ is H;

R⁴ is H;

each R^A is independently selected from halo, C_1-6 alkyl, C_2-6 alkenyl, C_2-6 alkynyl, C_1-6 haloalkyl, CN, NO₂, OR^a4, C(O)R^b4, C(O)NR^c4R^d4, C(O)OR^a4, NR^c4R^d4, NR^c4C(O)R^b4, S(O)R^b4, S(O)NR^c4R^d4, S(O)₂R^b4, and S(O)₂NR^c4R^d4, wherein said C_1-6 alkyl, C_2-6 alkenyl, and C_2-6 alkynyl are each optionally substituted by 1, 2, or 3, substituents independently selected from halo, C_1-6 haloalkyl, CN, NO₂, OR^a4, C(O)R^b4, C(O)NR^c4R^d4, C(O)OR^a4, NR^c4R^d4, NR^c4C(O)R^b4, S(O)R^b4, S(O)NR^c4R^d4, S(O)₂R^b4, and S(O)₂NR^c4R^d4;

R^X is H;

each Cy⁴ and Cy⁵ is independently selected from C_6-10 aryl, C_3-10 cycloalkyl, 5-10 membered heteroaryl, and 4-10 membered heterocycloalkyl, each of which is optionally substituted with 1, 2, 3, or 4 substituents independently selected from R^Cy;

each R^a1 is independently selected from C_1-6 alkyl optionally substituted with 1, 2, or 3 substituents independently selected from Cy⁵; and

each R^e5, R^e6, and R^e8 is independently selected from H, C_1-4 alkyl, and CN.

8. The method of claim 1, wherein:

X is CR^X;

Ring A is phenyl optionally substituted by 1 or 2 substituents independently selected from R^A;

Ring B is phenyl;

5-10 membered heteroaryl comprising carbon and 1, 2, 3 or 4 heteroatoms selected from N, O, and S;

C_3-7 cycloalkyl;

or 4-10 membered heterocycloalkyl comprising carbon and 1, 2, 3 or 4 heteroatoms selected from N, O, and S;

wherein said phenyl, 5-10 membered heteroaryl, C_3-7 cycloalkyl, and 4-10 membered heterocycloalkyl are each optionally substituted by 1, 2, 3, or 4 substituents independently selected from R^B;

R¹ is OR^a1;

R³ is H;

R⁴ is H;

each R^A is independently selected from halo, CN, and NO₂;

each R^B is independently selected from Cy⁴, halo, C_1-6 alkyl, ═

O, and C(O)OR^a5, wherein said C_1-6 alkyl is optionally substituted by Cy⁴;

R^X is H;

each Cy⁴ is independently selected from C_3-7 cycloalkyl and 4-7 membered heterocycloalkyl, each of which is optionally substituted with 1 or 2 substituents independently selected from R^Cy;

each Cy⁵ is independently selected from 4-7 membered heterocycloalkyl optionally substituted with 1 or 2 substituents independently selected from R^Cy;

each R^CY is selected from halo, C_1-4 alkyl, C_1-4 haloalkyl, C_1-4 cyanoalkyl, C_2-6 alkenyl, C_2-6 alkynyl, oxo, CN, NO₂, OR^a6, SR^a6, C(O)R^b6, C(O)NR^c6R^d6, C(O)OR^a6, NR^c6R^d6, NR^c6C(O)R^b6, S(O)₂R^b6, and S(O)₂NR^c6R^d6, wherein said C_1-4 alkyl, C_2-6 alkenyl, and C_2-6 alkynyl are each optionally substituted by 1 or 2 substituents independently selected from halo, CN, NO₂, OR^a6, SR^a6, C(O)R^b6, C(O)NR^c6R^d6, C(O)OR^a6, NR^c6R^d6, NR^c6C(O)R^b6, S(O)₂R^b6, and S(O)₂NR^c6R^d6;

each R^a1 is independently selected from C_1-3 alkyl optionally substituted with 1 or 2 substituents independently selected from Cy⁵; and

each R^a5 is independently selected from H, C_1-6 alkyl, C_1-4 haloalkyl, C_2-6 alkenyl, C_2-6 alkynyl, C_6-10 aryl, C_3-10 cycloalkyl, 5-10 membered heteroaryl, 4-10 membered heterocycloalkyl, C_6-10 aryl-C_1-4 alkyl-, C_3-10 cycloalkyl-C_1-4 alkyl-, (5-10 membered heteroaryl)-C_1-4 alkyl-, and (4-10 membered heterocycloalkyl)-C_1-4 alkyl-, wherein said C_1-6 alkyl, C_2-6 alkenyl, C_2-6 alkynyl, C_6-10 aryl, C_3-10 cycloalkyl, 5-10 membered heteroaryl, 4-10 membered heterocycloalkyl, C_6-10 aryl-C_1-4 alkyl-, C_3-10 cycloalkyl-C_1-4 alkyl-, (5-10 membered heteroaryl)-C_1-4 alkyl-, and (4-10 membered heterocycloalkyl)-C_1-4 alkyl- are each optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from C_1-4 alkyl, C_1-4 haloalkyl, C_1-4 cyanoalkyl, halo, CN, OR^a8, SR^a8, C(O)R^b8, C(O)NR^c8R^d8, C(O)OR^a8, OC(O)R^b8, OC(O)NR^c8R^d8, NR^c8R^d8, NR^c8C(O)R^b8, NR^c8C(O)NR^c8R^d8, NR^c8C(O)OR^a8, C(═

NR^e8)NR^c8R^d8, NR^c8C(═

NR^e8)NR^c8R^d8, S(O)R^b8, S(O)NR^c8R^d8, S(O)₂R^b8, NR^c8S(O)₂R^b8, NR^c8S(O)₂NR^c8R^d8, and S(O)₂NR^c8R^d8;

or any R^c5 and R^d5 together with the N atom to which they are attached form a 4-, 5-, 6-, or 7-membered heterocycloalkyl group optionally substituted with 1, 2, or 3 substituents independently selected from C_1-6 alkyl, C_3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C_6-10 aryl, 5-6 membered heteroaryl, C_1-6 haloalkyl, halo, CN, OR^a8, SR^a8, C(O)R^b8, C(O)NR^c8R^d8, C(O)OR^a8, OC(O)R^b8, OC(O)NR^c8R^d8, NR^c8R^d8, NR^c8C(O)R^b8, NR^c8C(O)NR^c8R^d8, NR^c8C(O)OR^a8, C(═

NR^e8)NR^c8R^d8, NR^c8C(═

NR^e8)NR^c8R^d8, S(O)R^b8, S(O)NR^c8R^d8, S(O)₂R^b8, NR^c8S(O)₂R^b8, NR^c8S(O)₂NR^c8R^d8, and S(O)₂NR^c8R^d8, wherein said C_1-6 alkyl, C_3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C_6-10 aryl, and 5-6 membered heteroaryl are each optionally substituted by 1, 2, or 3 substituents independently selected from halo, C_1-4 alkyl, C_1-4 haloalkyl, C_1-4 cyanoalkyl, CN, OR^a8, SR^a8, C(O)R^b8, C(O)NR^c8R^d8, C(O)OR^a8, OC(O)R^b8, OC(O)NR^c8R^d8, NR^c8R^d8, NR^c8C(O)R^b8, NR^c8C(O)NR^c8R^d8, NR^c8C(O)OR^a8, C(═

NR^e8)NR^c8R^d8, NR^c8C(═

NR^e8)NR^c8R^d8, S(O)R^b8, S(O)NR^c8R^d8, S(O)₂R^b8, NR^c8S(O)₂R^b8, NR^c8S(O)₂NR^c8R^d8, and S(O)₂NR^c8R^d8.

9. The method of claim 1, wherein X is N.

10. The method of claim 1, wherein X is CR^X.

11. The method of claim 1, wherein Ring A is C_6-10 aryl optionally substituted by 1, 2, 3, or 4 substituents independently selected from R^A.

12. The method of claim 1, wherein Ring A is phenyl optionally substituted by 1 or 2 substituents independently selected from R^A.

13. The method of claim 1, wherein Ring A is phenyl optionally substituted by 1 or 2 substituents independently selected from halo, CN, and NO₂.

14. The method of claim 1, wherein Ring B is phenyl;

5-10 membered heteroaryl comprising carbon and 1, 2, 3 or 4 heteroatoms selected from N, O, and S;

C_3-7 cycloalkyl;

or 4-10 membered heterocycloalkyl comprising carbon and 1, 2, 3 or 4 heteroatoms selected from N, O, and S;

wherein said phenyl, 5-10 membered heteroaryl, C_3-7 cycloalkyl, and 4-10 membered heterocycloalkyl are each optionally substituted by 1, 2, or 3 substituents independently selected from R^B.

15. The method of claim 1, wherein Ring B is phenyl, pyrazolyl, cyclohexenyl, dihydropyridinyl, 1H-indazolyl, 2,3-dihydro-1H-indolyl, 3,4-dihydro-2H-1,4-benzoxazinyl, 2,3-dihydro-1,4-benzodioxinyl, 2,3-dihydro-1,3-benzoxazolyl, 1,2,3,4-tetrahydroquinolinyl, 2,3-dihydro-benzimidazolyl, 1H-pyrazolo[3,4-b]pyridinyl, 1H-benzimidazolyl, 3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazinyl, quinolinyl, 1,3-benzothiazolyl, pyridinyl, 1,5-naphthyridinyl, quinoxalinyl, 2,3-dihydrooxazolo[4,5-b]pyridinyl, 3H-imidazo[4,5-b]pyridinyl, furo[3,2-b]pyridinyl, 3,4-dihydro-2H-pyrano[2,3-b]pyridinyl, 2,3-dihydro-[1,4]dioxino[2,3-b]pyridinyl, 1H-pyrrolo[2,3-b]pyridinyl, 2,3-dihydro-1H-indenyl, 1,4-dihydro-2H-3,1-benzoxazinyl, 3H-[1,2,3]triazolo[4,5-b]pyridinyl, 2,3-dihydro-1H-isoindolyl, imidazo[4,5-b]pyridinyl, or pyrimidinyl, each optionally substituted by 1, 2, or 3 substituents independently selected from C_3-7 cycloalkyl, 5-6 membered heterocycloalkyl, halo, C_1-6 alkyl, C_1-6 haloalkyl, ═

O, CN, OR^a5, NR^c5C(O)OR^a5, NR^c5R^d5, C(O)NR^c5R^d5, and C(O)OR^a5, wherein said C_1-6 alkyl is optionally substituted by 5-6 membered heterocycloalkyl, CN, OR^a5, NR^c5C(O)OR^a5, or NR^c5C(O)NR^c5R^d5.

16. The method of claim 1, wherein Ring B is phenyl, pyrazolyl, cyclohexenyl, dihydropyridinyl, 1H-indazolyl, 2,3-dihydro-1H-indolyl, 3,4-dihydro-2H-1,4-benzoxazinyl, or 2,3-dihydro-1,4-benzodioxinyl, each optionally substituted by 1, 2, or 3 substituents independently selected from C_3-7 cycloalkyl, 5-6 membered heterocycloalkyl, halo, C_1-6 alkyl, ═

O, and C(O)OR^a5, wherein said C_1-6 alkyl is optionally substituted by 5-6 membered heterocycloalkyl.

17. The method of claim 1, wherein group:

18. The method of claim 1, wherein R¹ is OR^a1 or Cy¹.

19. The method of claim 1, wherein R¹ is OR^a1 or 4-10 membered heterocycloalkyl.

20. The method of claim 1, wherein R¹ is OR^a1.

21. The method of claim 1, wherein R¹ is (i) C_1-6 alkyl substituted with NR^c1R^d1 or (ii) NR^c1R^d1, wherein R^c1 is H and R^d1 is substituted with NR^c8R^d8;

or R^c1 and R^d1 together with the N atom to which they are attached form a 4-, 5-, 6-, or 7-membered heterocycloalkyl group substituted with NR^c8R^d8.

22. The method of claim 1, wherein R¹ is independently selected from pyrrolidinylmethoxy optionally substituted by methyl;

piperidinylmethoxy optionally substituted by methyl, ethyl, 2-hydroxyethyl, 2-cyanoethyl, 2-hydroxypropyl, 2-methoxyethyl, or 2-hydroxy-2-methylpropyl;

4-(dimethylamino)piperidinyl; and

3-(dimethylamino)pyrrolidinyl.

23. The method of claim 1, wherein R¹ is 3-piperidinylmethoxy, 3-pyrrolidinylmethoxy, 1-piperidinyl, or 1-pyrrolidinyl, each of which is optionally substituted with a member selected from methyl, ethyl, 2-hydroxyethyl, 2-cyanoethyl, 2-hydroxypropyl, 2-methoxyethyl, 2-hydroxy-2-methylpropyl and 4-(dimethylamino).

24. The method of claim 1, wherein R¹ is 3-piperidinylmethoxy, 3-pyrrolidinylmethoxy, 1-piperidinyl, 1-pyrrolidinyl, 1-methylpiperidin-3-yl-methoxy, 1-(2-hydoxyethyl)piperidin-3-yl, 1-(2-cyanoethyl)piperidin-3-yl, 1-(2-hydoxypropyl)piperidin-3-yl, 1-(2-methoxyethyl)piperidin-3-yl, 1-(2-hydoxy-2-methylpropyl)piperidin-3-yl, 4-(dimethylamino)piperidin-1-yl, 1-ethylpiperidin-3-yl-methoxy, or 3-(dimethylamino)pyrrolidin-1-yl.

25. The method of claim 1, wherein R¹ is pyrrolidinylmethoxy optionally substituted by methyl.

26. The method of claim 1, wherein R³ is H.

27. The method of claim 1, wherein R⁴ is H.

28. The method of claim 1, wherein each R^A is independently selected from halo, C_1-6 alkyl, C_2-6 alkenyl, C_2-6 alkynyl, C_1-6 haloalkyl, CN, NO₂, OR^a4, C(O)R^b4, C(O)NR^c4R^d4, C(O)OR^a4, NR^c4R^d4, NR^c4C(O)R^b4, S(O)R^b4, S(O)NR^c4R^d4, S(O)₂R^b4, and S(O)₂NR^c4R^d4, wherein said C_1-6 alkyl, C_2-6 alkenyl, and C_2-6 alkynyl are each optionally substituted by 1, 2, or 3, substituents independently selected from halo, C_1-6 haloalkyl, CN, NO₂, OR^a4, C(O)R^b4, C(O)NR^c4R^d4, C(O)OR^a4, NR^c4R^d4, NR^c4C(O)R^b4, S(O)R^b4, S(O)NR^c4R^d4, S(O)₂R^b4, and S(O)₂NR^c4R^d4.

29. The method of claim 1, wherein each R^A is independently selected from halo, CN, and NO₂.

30. The method of claim 1, wherein R^A is CN.

31. The method of claim 1, wherein each R^B is independently selected from Cy⁴, halo, CN, C_1-6 alkyl, C_1-6 haloalkyl, ═

O, OR^a5, NR^c5C(O)OR^a5, NR^c5R^d5, C(O)NR^c5R^d5, and C(O)OR^a5, wherein said C_1-6 alkyl is optionally substituted by Cy⁴, CN, OR^a5, NR^c5C(O)OR^a5, or NR^c5C(O)NR^c5R^d5.

32. The method of claim 1, wherein each R^B is independently selected from Cy⁴, halo, C_1-6 alkyl, ═

O, and C(O)OR^a5, wherein said C_1-6 alkyl is optionally substituted by Cy⁴.

33. The method of claim 1, wherein each R^B is independently selected from C_3-7 cycloalkyl, 5-6 membered heterocycloalkyl, halo, C_1-4 alkyl wherein said C_1-4 alkyl is optionally substituted by CN, OH, N(C_1-4 alkyl)C(O)O(C_1-4 alkyl), —

O—

(C_1-4 alkyl) or N(C_1-4 alkyl)C(O)N(C_1-4 alkyl)₂;

C_1-6 haloalkyl, ═

O, C(O)O(C_1-4 alkyl), OH, C_1-4 alkoxy, N(C_1-4 alkyl)C(O)O(C_1-4 alkyl), CN, NH₂, NH(C_1-4 alkyl), C(O)NH(C_1-4 alkyl), and (5-6 membered heterocycloalkyl)-C_1-4 alkyl- wherein said (5-6 membered heterocycloalkyl)-C_1-4 alkyl- is optionally substituted by C_1-4 alkyl.

34. The method of claim 1, wherein each R^B is independently selected from C_3-7 cycloalkyl, 5-6 membered heterocycloalkyl, halo, C_1-4 alkyl, ═

O, C(O)O(C_1-4 alkyl), and (5-6 membered heterocycloalkyl)-C_1-4 alkyl- wherein said (5-6 membered heterocycloalkyl)-C_1-4 alkyl- is optionally substituted by C_1-4 alkyl.

35. The method of claim 1, wherein each R^B is independently selected from cyclobutyl, morpholino, chloro, fluoro, methyl, ethyl, 2-propyl, cyclopropyl, difluoromethyl, ═

O, t-butoxycarbonyl, morpholinomethyl, morpholinoethyl, hydroxymethyl, methoxy, —

N(CH₃)C(O)O(CH₃), —

CH₂—

N(CH₃)C(O)O(CH₃), 2-oxopyrrolidinyl, CN, NH₂, OH, 1-hydroxy-1-methylethyl, dimethylamino, —

CH₂—

N(CH₃)C(O)N(CH₃)₂, difluoromethoxy, ethoxy, methoxymethyl, 1-hydroxyethyl, 1-cyano-1-methylethyl, C(O)NH(CH₃) and 4-methyl-piperazinylmethyl.

36. The method of claim 1, wherein each R^B is independently selected from cyclobutyl, morpholino, chloro, fluoro, methyl, ethyl, ═

O, t-butoxycarbonyl, morpholinomethyl, morpholinoethyl, and 4-methyl-piperazinylmethyl.

37. The method of claim 1, wherein R^X is H.

38. The method of claim 1, wherein each Cy¹, Cy³, Cy⁴, and Cy⁵ is independently selected from phenyl, C_3-7 cycloalkyl, 5-6 membered heteroaryl, and 4-7 membered heterocycloalkyl, each of which is optionally substituted with 1, 2, 3, or 4 substituents independently selected from R^Cy.

39. The method of claim 1, wherein each Cy⁴ is independently selected from C_3-7 cycloalkyl and 4-7 membered heterocycloalkyl, each of which is optionally substituted with 1 or 2 substituents independently selected from R^Cy.

40. The method of claim 1, wherein each Cy⁴ is independently selected from cyclobutyl, morpholino, 2-oxopyrrolidinyl and piperazinyl, each of which is optionally substituted with C_1-4 alkyl.

41. The method of claim 1, wherein each Cy⁴ is independently selected from cyclobutyl, morpholino, and piperazinyl, each of which is optionally substituted with C_1-4 alkyl.

42. The method of claim 1, wherein each Cy⁵ is independently selected from 4-10 membered heterocycloalkyl optionally substituted with 1 or 2 substituents independently selected from R^Cy.

43. The method of claim 1, wherein each Cy⁵ is independently selected from pyrrolidinyl and piperidinyl, each of which is optionally substituted with 1 or 2 substituents independently selected from R^Cy.

44. The method of claim 1, wherein each R^Cy is independently selected from C_1-4 alkyl, oxo, and NR^c6R^d6, wherein said C_1-4 alkyl is optionally substituted with 1 or 2 substituents independently selected from CN and OR^a6.

45. The method of claim 4, wherein each R^a1 is independently selected from C_1-6 alkyl optionally substituted with 1, 2, or 3 substituents independently selected from Cy⁵.

46. The method of claim 4, wherein each R^a1 is independently selected from C_1-3 alkyl optionally substituted with 1 or 2 substituents independently selected from Cy⁵.

47. The method of claim 1, wherein each R^a1 is independently selected from (pyrrolidinyl)methyl which is optionally substituted on the pyrrolidinyl moiety by a methyl group-;

and (piperidinyl)methyl- which is optionally substituted on the piperidinyl moiety by methyl, ethyl, 2-hydroxyethyl, 2-cyanoethyl, 2-hydroxypropyl, 2-methoxyethyl, or 2-hydroxy-2-methylpropyl.

48. The method of claim 1, wherein each R^a1 is independently selected from (pyrrolidinyl)methyl- which is optionally substituted on the pyrrolidinyl moiety by a methyl group.

49. The method of claim 1, wherein the compound is a compound having Formula IIa:

50. The method of claim 1, wherein the compound is a compound having Formula IIb:

51. The method of claim 1, wherein the compound is a compound having Formula IIIa:

52. The method of claim 1, wherein the compound is a compound having Formula IIIb:

53. The method of claim 1, wherein the compound is a compound having Formula IVa:

54. The method of claim 1, wherein the compound is a compound having Formula IVb:

55. The method of claim 1, wherein the compound is a compound having Formula Va:

56. The method of claim 1, wherein the compound is a compound having Formula Vb:

57. The method of claim 1, wherein the compound is a compound having Formula VIa or Formula VIb:

58. The method of claim 1, wherein the compound is a compound having Formula VIIa or Formula VIIb:

59. The method of claim 1, wherein the compound is a compound having Formula VIIIa or Formula VIIIb:

60. The method of claim 1, wherein the compound is a compound having Formula IXa or Formula IXb:

61. The method of claim 1, wherein the compound is a compound having Formula Xa or Formula Xb

62. The method of claim 1, wherein the compound is a compound having Formula XIa or XIb

63. The method of claim 1, wherein the compound is selected from:

4-{5-(4-methylphenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

6-(4-fluorophenyl)-5-(4-methylphenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridine;

5-(4-methylphenyl)-6-(4-nitrophenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridine;

2-fluoro-4-{5-(4-methylphenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

3-fluoro-4-{5-(4-methylphenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(4-chlorophenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(1-cyclobutyl-1H-pyrazol-4-yl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(2-fluoro-4-methylphenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(4-ethylcyclohex-1-en-1-yl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

tert-butyl 4-{6-(4-cyanophenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-5-yl}-3,6-dihydropyridine-1(2H)-carboxylate;

4-{5-(1-methyl-1H-indazol-5-yl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(1-methyl-2-oxo-2,3-dihydro-1H-indol-5-yl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo-[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(4-morpholin-4-ylphenyl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(4-methyl-3,4-dihydro-2H-1,4-benzoxazin-7-yl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(4-methyl-3,4-dihydro-2H-1,4-benzoxazin-6-yl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo-[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-(2,3-dihydro-1,4-benzodioxin-6-yl)-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-[4-(morpholin-4-ylmethyl)phenyl]-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-[4-(2-morpholin-4-ylethyl)phenyl]-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-{5-{4-[(4-methylpiperazin-1-yl)methyl]phenyl}-8-[(3R)-pyrrolidin-3-ylmethoxy]imidazo-[1,5-a]pyridin-6-yl})benzonitrile; and

4-(5-(4-methylphenyl)-8-{[(3R)-1-methylpyrrolidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile,

or a pharmaceutically acceptable salt of any of the aforementioned.

64. The method of claim 1, wherein the compound is selected from:

4-(5-(3-methyl-2-oxo-2,3-dihydro-1,3-benzoxazol-6-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(1-methyl-2-oxo-2,3-dihydro-1H-indol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(1-methyl-1H-indazol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(1-methyl-2-oxo-1,2,3,4-tetrahydroquinolin-6-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(4-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(1,3-dimethyl-2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-[8-{[(3R)-1-methylpiperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-(5-(1-methyl-1H-benzimidazol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(4-methyl-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(5-fluoro-3-methyl-2-oxo-2,3-dihydro-1,3-benzoxazol-6-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(8-{[(3R)-1-methylpiperidin-3-yl]methoxy}-5-quinolin-6-ylimidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(1,3-dimethyl-1H-indazol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(1,3-benzothiazol-6-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

(R)-4-(5-(benzo[d]thiazol-5-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(2-methyl-1,3-benzothiazol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

2-fluoro-4-[8-{[(3R)-1-methylpiperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-{[(3R)-1-(2-hydroxyethyl)piperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-{[(3R)-1-(2-cyanoethyl)piperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-{[(3R)-1-(2-hydroxypropyl)piperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-{[(3R)-1-(2-methoxyethyl)piperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-{[(3R)-1-(2-hydroxy-2-methylpropyl)piperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-(5-[3-(hydroxymethyl)-4-methylphenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-(5-fluoro-6-methoxypyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-[3-fluoro-4-(hydroxymethyl)-5-methylphenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(5-[4-(hydroxymethyl)-3-methylphenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

Methyl [4-(6-(4-cyanophenyl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy)}imidazo[1,5-a]pyrazin-5-yl)phenyl]methylcarbamate;

4-(5-[3,5-difluoro-4-(hydroxymethyl)phenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

methyl [4-(6-(4-cyanophenyl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy)}imidazo[1,5-a]pyrazin-5-yl)-2-fluorobenzyl]methylcarbamate;

methyl [5-(6-(4-cyanophenyl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo [1,5-a]pyrazin-5-yl)pyridin-2-yl]methylcarbamate;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(1-methyl-1H-pyrazolo[3,4-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(3-methyl-2-oxo-2,3-dihydro-1,3-benzoxazol-6-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(1-methyl-2-oxo-2,3-dihydro-1H-indol-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(6-methoxypyridin-3-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-{8-[4-(dimethylamino)piperidin-1-yl]-5-[6-(2-oxopyrrolidin-1-yl)pyridin-3-yl]imidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(1,5-naphthyridin-3-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

(R)-4-(8-((1-methylpiperidin-3-yl)methoxy)-5-(quinoxalin-6-yl)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3-methyl-2-oxo-2,3-dihydrooxazolo[4,5-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3-methyl-3H-imidazo[4,5-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(8-((1-methylpiperidin-3-yl)methoxy)-5-(1,5-naphthyridin-3-yl)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(furo[3,2-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3,4-dihydro-2H-pyrano[2,3-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(2,3-dihydro-[1,4]dioxino[2,3-b]pyridin-7-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3-methyl-2-oxo-2,3-dihydrobenzo[d]oxazol-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(1-methyl-2-oxoindolin-5-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(4-methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-7-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(8-((1-ethylpiperidin-3-yl)methoxy)-5-(3-methyl-3H-imidazo[4,5-b]pyridin-6-yl)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(2,3-dihydro-[1,4]dioxino[2,3-b]pyridin-7-yl)-8-((1-ethylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3,4-dihydro-2H-pyrano[2,3-b]pyridin-6-yl)-8-((1-ethylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(5-amino-6-methoxypyridin-3-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(5-fluoro-6-methoxypyridin-3-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(8-((1-methylpiperidin-3-yl)methoxy)-5-(6-(2-oxopyrrolidin-1-yl)pyridin-3-yl)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(6-methoxypyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3,5-difluoro-4-(hydroxymethyl)phenyl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

Methyl [5-(6-(4-cyanophenyl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-5-yl)pyridin-2-yl]methylcarbamate;

4-(5-[3-fluoro-4-(hydroxymethyl)-5-methylphenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(5-hydroxy-6-methylpyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-[4-(1-hydroxy-1-methylethyl)phenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(5-fluoro-6-morpholin-4-ylpyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-[4-(hydroxymethyl)-3-methylphenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-[6-(dimethylamino)pyridin-3-yl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(5,6-dimethylpyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

N-[4-(6-(4-cyanophenyl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-5-yl)-2-fluorobenzyl]-N,N′

,N′

-trimethylurea;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(1-methyl-1H-benzimidazol-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-(8-(4-(dimethylamino)piperidin-1-yl)-5-(1-methyl-1H-pyrrolo[2,3-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-[8-{[(3R)-1-methylpiperidin-3-yl]methoxy}-5-(1-methyl-1H-pyrrolo[2,3-b]pyridin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-(5-(5,6-dimethylpyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

(R)-methyl (4-(6-(4-cyanophenyl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyrazin-5-yl)-2-fluorophenyl)(methyl)carbamate;

4-(5-(5-fluoro-6-methylpyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(5,6-dimethylpyridin-3-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(5-fluoro-6-methoxypyridin-3-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-{8-[4-(dimethylamino)piperidin-1-yl]-5-[3-(hydroxymethyl)-4-methylphenyl]imidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-{8-[4-(dimethylamino)piperidin-1-yl]-5-[2-(hydroxymethyl)-4-methylphenyl]imidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(6-methoxy-5-methylpyridin-3-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

methyl (4-{6-(4-cyanophenyl)-8-[4-(dimethylamino)piperidin-1-yl]imidazo[1,5-a]pyrazin-5-yl}-2-fluorophenyl)methylcarbamate;

methyl (4-(6-(4-cyanophenyl)-8-(4-(dimethylamino)piperidin-1-yl)imidazo[1,5-a]pyrazin-5-yl)phenyl)(methyl)carbamate;

methyl (5-(6-(4-cyanophenyl)-8-(4-(dimethylamino)piperidin-1-yl)imidazo[1,5-a]pyrazin-5-yl)pyridin-2-yl)(methyl)carbamate;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(5-fluoro-6-methylpyridin-3-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-{5-[6-(difluoromethoxy)pyridin-3-yl]-8-[4-(dimethylamino)piperidin-1-yl]imidazo[1,5-a]pyrazin-6-yl)}benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(6-ethoxypyridin-3-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(1-methyl-1H-indazol-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-(5-(2-hydroxy-2,3-dihydro-1H-inden-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

2-fluoro-4-(5-(1-methyl-2-oxo-1,2,3,4-tetrahydroquinolin-6-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(8-(4-(dimethylamino)piperidin-1-yl)-5-(quinoxalin-6-yl)imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-(8-(4-(dimethylamino)piperidin-1-yl)-5-(furo[3,2-b]pyridin-6-yl)imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(4-methyl-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(1-methyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(3-methyl-3H-imidazo[4,5-b]pyridin-6-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(3-ethyl-2-oxo-2,3-dihydro-1,3-benzoxazol-6-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(4-fluoro-1,3-dimethyl-2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-{[(3R)-1-ethylpiperidin-3-yl]methoxy}-5-(1-methyl-2-oxo-2,3-dihydro-1H-indol-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-{[(3R)-1-ethylpiperidin-3-yl]methoxy}-5-(5-fluoro-3-methyl-2-oxo-2,3-dihydro-1,3-benzoxazol-6-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

(S)-4-(8-(3-(dimethylamino)pyrrolidin-1l-yl)-5-(3-methyl-2-oxo-2,3-dihydrobenzo[d]oxazol-6-yl)imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-[8-[(3 S)-3-(dimethylamino)pyrrolidin-1-yl]-5-(5-fluoro-3-methyl-2-oxo-2,3-dihydro-1,3-benzoxazol-6-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

(R)-4-(8-((1-ethylpiperidin-3-yl)methoxy)-5-(1-methyl-2-oxoindolin-5-yl)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(2,3-dihydro-[1,4]dioxino[2,3-b]pyridin-7-yl)-8-((1-(2-methoxyethyl)piperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(4-methyl-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(3-ethyl-3H-[1,2,3]triazolo[4,5-b]pyridin-6-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(2,3-dihydro[1,4]dioxino[2,3-b]pyridin-7-yl)-8-{[(3R)-1-(2-hydroxypropyl)piperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(furo[3,2-b]pyridin-6-yl)-8-(((3R)-1-(2-hydroxypropyl)piperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(8-(((3R)-1-(2-hydroxypropyl)piperidin-3-yl)methoxy)-5-(quinoxalin-6-yl)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-furo[3,2-b]pyridin-6-yl-8-{[(3R)-1-(2-methoxyethyl)piperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3,4-dihydro-2H-pyrano[2,3-b]pyridin-6-yl)-8-((1-(2-methoxyethyl)piperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-[4-(1-hydroxyethyl)phenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-[3,5-difluoro-4-(1-hydroxyethyl)phenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-[8-{[(3R)-1-methylpiperidin-3-yl]methoxy}-5-(6-methylpyridin-3-yl)imidazo[1,5-a]pyridin-6-yl]benzonitrile;

4-(5-[3-fluoro-4-(1-hydroxyethyl)-5-methylphenyl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(5-fluoro-6-methylpyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-{8-{[(3R)-1-ethylpiperidin-3-yl]methoxy}-5-[3-fluoro-4-(hydroxymethyl)-5-methylphenyl]imidazo[1,5-a]pyridin-6-yl}benzonitrile;

4-(5-[3-fluoro-4-(hydroxymethyl)-5-methylphenyl]-8-{[(3R)-1-(2-methoxyethyl)piperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(5,6-dimethylpyridin-3-yl)-8-{[(3R)-1-(2-methoxyethyl)piperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(5,6-dimethylpyridin-3-yl)-8-{[(3R)-1-ethylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-[6-(1-cyano-1-methylethyl)pyridin-3-yl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(6-ethylpyridin-3-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(1-cyclobutyl-1H-pyrazol-4-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile; and

5-(6-(4-cyanophenyl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-5-yl)-N-methylpyridine-2-carboxamide;

or a pharmaceutically acceptable salt of any of the aforementioned.

65. The method of claim 1, wherein the compound is selected from:

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(2-hydroxy-2,3-dihydro-1H-inden-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(1-methyl-2-oxo-1,2,3,4-tetrahydroquinolin-6-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-(8-(4-(dimethylamino)piperidin-1-yl)-5-(7-fluoro-1,3-dimethyl-2-oxo-2,3-dihydro-1H-benzo[d]imidazol-5-yl)imidazo[1,5-a]pyrazin-6-yl)benzonitrile;

4-{5-(1-cyclobutyl-1H-pyrazol-4-yl)-8-[4-(dimethylamino)piperidin-1-yl]imidazo[1,5-a]pyrazin-6-yl)}benzonitrile;

4-{5-[5-(difluoromethyl)-6-methylpyridin-3-yl]-8-[4-(dimethylamino)piperidin-1-yl]imidazo[1,5-a]pyrazin-6-yl}benzonitrile;

5-{6-(4-cyanophenyl)-8-[4-(dimethylamino)piperidin-1-yl]imidazo[1,5-a]pyrazin-5-yl}-N-methylpyridine-2-carboxamide;

4-{8-[4-(dimethylamino)piperidin-1-yl]-5-[5-(hydroxymethyl)-6-methylpyridin-3-yl]imidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-{5-[2-(difluoromethyl)-1-methyl-1H-benzimidazol-5-yl]-8-[4-(dimethylamino)piperidin-1-yl]imidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-{8-[4-(dimethylamino)piperidin-1-yl]-5-quinolin-3-ylimidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-{8-[4-(dimethylamino)piperidin-1-yl]-5-quinolin-6-ylimidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-[8-{[(3R)-1-ethylpiperidin-3-yl]methoxy}-5-(6-methylpyridin-3-yl)imidazo[1,5-a]pyridin-6-yl]benzonitrile;

4-(5-[5-(methoxymethyl)-6-methylpyridin-3-yl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

5-{6-(4-cyanophenyl)-8-[4-(dimethylamino)piperidin-1-yl]imidazo[1,5-a]pyrazin-5-yl}-2-methoxynicotinonitrile;

4-{8-[4-(dimethylamino)piperidin-1-yl]-5-[4-(hydroxymethyl)-3-methylphenyl]imidazo[1,5-a]pyrazin-6-yl}benzonitrile;

4-[8-[4-(dimethylamino)piperidin-1-yl]-5-(2-methoxypyrimidin-5-yl)imidazo[1,5-a]pyrazin-6-yl]benzonitrile;

4-(5-[6-(1-hydroxy-1-methylethyl)pyridin-3-yl]-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(4-methyl-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(1,2-dimethyl-1H-benzimidazol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

4-(5-(2-methyl-1-oxo-2,3-dihydro-1H-isoindol-5-yl)-8-{[(3R)-1-methylpiperidin-3-yl]methoxy}imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3-isopropyl-3H-[1,2,3]triazolo[4,5-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(3-cyclopropyl-3H-[1,2,3]triazolo[4,5-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

(R)-4-(5-(2-isopropyl-3-methyl-3H-imidazo[4,5-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile; and

(R)-4-(5-(2-cyclopropyl-3-methyl-3H-imidazo[4,5-b]pyridin-6-yl)-8-((1-methylpiperidin-3-yl)methoxy)imidazo[1,5-a]pyridin-6-yl)benzonitrile;

or a pharmaceutically acceptable salt of any of the aforementioned.