Substituted benzamides and substituted pyridinecarboxamides as Btk inhibitors

1. A compound according to Formula I, or a pharmaceutically acceptable salt thereof,

wherein:

A 1 , A 2 , A 3 , and A 4 are independently C, CH, CR 11 or N and bicyclic ring system E-G is selected from the group consisting of:

R 11 is independently selected from the group consisting of:

a) deuterium,

b) H,

c) halogen,

d) cyano,

e) —CH═CH 2 ,

f) —COOH,

g) —CO 2 (1-6C)alkyl,

h) —CO(1-6C)alkyl,

i) —CONH(1-6C)alkoxy,

j) —CONH(1-6C)alkyl,

k) —CON((1-6C)alkyl) 2 ,

l) (1-6C)alkyl,

m) (3-7C)cycloalkyl,

n) (1-6C)alkoxy,

o) aryl,

p) (1-5C)heteroaryl,

q) (2-6C)alkenyl,

r) (2-6C)alkynyl, and

s) (4-7C)heterocycloalkyl,

wherein

R 11 is optionally substituted with one or more groups selected from: halogen, (1-6C)alkyl, (1-5C)alkoxy, OH, or oxo;

R 12 is independently selected from the group consisting of: H, (1-3C)alkyl, (1-3C)alkylNHC(O), (1-3C)alkylOC(O), and (1-3C)alkylC(O);

R 13 is independently selected from the group consisting of: H and (1-4C)alkoxy;

wherein in aromatic ring K

B 1 , B 2 , B 3 , B 4 together are selected from the following groups:

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is C(R 10 );

B 1 is N, B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is C(R 10 );

B 1 is C(R 7 ), B 2 is N, B 3 is C(R 9 ), and B 4 is C(R 10 );

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is N, and B 4 is C(R 10 ); and

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is N;

R 7 is H, halogen, OH, (1-3C)alkyl, (1-6C)alkoxy, (3-6C)cycloalkoxy, (1-5C)heterocycloalkoxy, halo(1-3C)alkyl, or CN; wherein R 7 may optionally be substituted with one, two or three halogens, OH, (2-4C)alkynyl, —C(O)NH 2 , —C(O)OH, or —C(O)(1-4C)alkyl;

R 8 is H, halogen, OH, (1-3C)alkyl, (1-6C)alkoxy, (3-6C)cycloalkoxy, (1-5C)heterocycloalkoxy, halo(1-3C)alkyl, or CN; wherein R 8 may optionally be substituted with one, two or three halogens, OH, (2-4C)alkynyl, —C(O)NH 2 , —C(O)OH, or —C(O)(1-4C)alkyl;

R 9 is H, halogen, OH, (1-3C)alkyl, (1-6C)alkoxy, (3-6C)cycloalkoxy, (1-5C)heterocycloalkoxy, halo(1-3C)alkyl, or CN; wherein R 9 may optionally be substituted with one, two or three halogens, OH, (2-4C)alkynyl, —C(O)NH 2 , —C(O)OH, or —C(O)(1-4C)alkyl;

R 10 is H, halogen, OH, (1-3C)alkyl, (1-6C)alkoxy, (3-6C)cycloalkoxy, (1-5C)heterocycloalkoxy, halo(1-3C)alkyl, or CN; wherein R 10 may optionally be substituted with one, two or three halogens, OH, (2-4C)alkynyl, —C(O)NH 2 , —C(O)OH, or —C(O)(1-4C)alkyl;

wherein in ring L

W is CH or N;

X is C(R 6a ), N, O or S;

Y is C(R 6 ), N(R 6b ), O or S;

Z is C(R 6a ), N or a bond;

R 5 is H, halogen, CN, (1-4C)alkyl, (1-5C)alkoxy, (3-6C)cycloalkyl, (3-6C)cycloalkoxy, or —C(O)O(1-3C)alkyl; wherein R 5 may optionally be substituted with one, two or three halogens, OH, or (1-3C)alkoxy; or

R 5 is aryl, (1-5C)heteroaryl or (2-6C)heterocycloalkyl, wherein R 5 may optionally be substituted with halogen, (1-6C)alkyl, or (1-3C)alkoxy;

R 6 is H, halogen, CN, (1-6C)alkyl, or (1-6C)alkoxy; wherein R 6 may optionally be substituted with one, two or three halogens, or CN;

R 6a is H, (1-4C)alkyl or (3-6C)cycloalkyl;

R 6b is H, (1-3C)alkyl, (3-6C)cycloalkyl, or —C(O)O(1-4C)alkyl; or

R 5 and R 6 together can form a carbocyclic or heterocyclic 5- to 6-membered ring, and optionally be unsaturated or aromatic; or R 5 and R 6 together can form (3-7C)cycloalkenyl or (2-6C)heterocycloalkenyl; each optionally substituted with (1-3C)alkyl or with one or more halogen;

Q is C═O, C(R f ) 2 or C═N(R h );

T is C(R e ) 2 , O, NR e , or a bond;

U is C(R d ) 2 , O, or NR d ;

V is C(R g ) 2 , O, or a bond;

R c , R d , R e , and R f are each independently selected from H, halogen, (1-6C)alkyl, OH, (2-6C)alkenyl, or —C(O)R z , wherein R z is independently selected from (1-5C)heteroaryl, aryl and OH,

and further wherein any alkyl group of R c , R d , R e , or R f may optionally be substituted with OH, —C(O)(1-3C)alkoxy or —C(O)OH;

R g is independently selected from H, halogen, (1-6C)alkyl, (1-6C)alkoxy, halo(1-6C)alkyl, or OH; and

R h is independently selected from H or CN;

with the proviso that:

1) up to 2 atoms of X, Y, and Z can simultaneously be a heteroatom;

2) when one atom selected from X or Y is O or S, then Z is a bond and the other atom selected from X or Y cannot be O or S;

3) when Z is CH or N, then Y is C(R 6 ) or N and X is CH, or N;

5) when Q is C(R f ) 2 , then T is C(R e ) 2 ;

6) when T is NR e , then R e is not halogen; and

7) when U is NR d , then R d is not halogen.

2. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein in aromatic ring K, B 1 , B 2 , B 3 and B 4 together are selected from the following groups:

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is C(R 10 );

B 1 is N, B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is)C(R 10 );

B 1 is C(R 7 ), B 2 is N, B 3 is C(R 9 ), and B 4 is)C(R 10 ); and

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is N, and B 4 is)C(R 10 ).

3. The compound of claim 2 , or a pharmaceutically acceptable salt thereof, wherein in aromatic ring K, B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is C(R 10 ), wherein R 7 , R 8 , R 9 and R 10 are each independently selected from H, halogen, (1-3C)alkyl, (1-3C)alkoxy or halo(1-3C)alkyl; and further wherein any alkoxy may optionally be substituted with one, two or three halogens.

4. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein ring L is selected from the group consisting of phenyl, pyridyl, pyrimidyl, pyridazyl, triazinyl, thiazolyl, oxazolyl, isoxazolyl, pyrazolyl, imidazolyl, thiadiazolyl, and isothiazolyl.

5. The compound of claim 4 , or a pharmaceutically acceptable salt thereof, wherein ring L is selected from the group consisting of:

6. The compound of claim 4 , or a pharmaceutically acceptable salt thereof, wherein ring L is pyridyl.

7. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 5 is selected from the group consisting of H, fluoro, chloro, CN, cyclopropyl, cyclobutyl, oxetanyl, (1-3C)alkyl, (1-5C)alkoxy, and (3-5C)cycloalkoxy; wherein the alkyl, alkoxy, cycloalkyl and cycloalkoxy of R 5 are optionally substituted with one or more halogens.

8. The compound of claim 7 , or a pharmaceutically acceptable salt thereof, wherein R 5 is selected from the group consisting of H, fluoro, methyl, ethyl, propyl, cyclopropyl, cyclobutyl, cyclopropoxy, and trifluoromethyl.

9. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 11 is selected from the group consisting of H, deuterium, fluoro, chloro, bromo, methyl, ethyl, cyclopropyl and vinyl.

10. The compound of claim 9 , or a pharmaceutically acceptable salt thereof, wherein R 11 is selected from the group consisting of H, fluro and chloro.

11. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein bicyclic ring system E-G is selected from the group consisting of:

12. A compound of claim 11 , or a pharmaceutically acceptable salt thereof, wherein bicyclic ring system E-G is

13. The compound of claim 1 , having Formula Ie:

or a pharmaceutically acceptable salt thereof.

14. The compound of claim 13 , or a pharmaceutically acceptable salt thereof, wherein

R 7 , R 8 , R 9 , and R 10 are independently selected from H, halogen, or (1-3C)alkoxy;

R 11 is H, halogen or (1-3C)alkyl, wherein the alkyl is optionally substituted with one, two or three halogen;

R c is H or methyl; and

R d is H or methyl.

15. A pharmaceutical composition which comprises the compound of claim 1 , or a pharmaceutically acceptable salt thereof, and one or more pharmaceutically acceptable excipients.

16. The pharmaceutical composition of claim 15 , which further comprises at least one additional therapeutically active agent.

17. The pharmaceutical composition of claim 16 , wherein the additional therapeutically active agent is an anti-inflammatory agent, an immunosuppressant agent, or a chemotherapeutic agent.

18. A method for modulating Bruton's tyrosine kinase activity in a subject, comprising administering to the subject a therapeutically effective amount of the compound of claim 1 , or a pharmaceutically acceptable salt thereof.

19. The method of claim 18 , wherein the subject suffers from a Bruton's tyrosine kinase mediated disorder selected from the group consisting of rheumatoid arthritis, psoriatic arthritis, infectious arthritis, progressive chronic arthritis, deforming arthritis, osteoarthritis, traumatic arthritis, gouty arthritis, Reiter's syndrome, polychondritis, acute synovitis, acute spondylitis, glomerulonephritis with nephrotic syndrome, glomerulonephritis without nephrotic syndrome, autoimmune hematologic disorder, hemolytic anemia, aplasic anemia, idiopathic thrombocytopenia, neutropenia, autoimmune gastritis, autoimmune inflammatory bowel disease, ulcerative colitis, Crohn's disease, host versus graft disease, allograft rejection, chronic thyroiditis, Graves' disease, schleroderma, type I diabetes, type II diabetes, acute active hepatitis, chronic active hepatitis, pancreatitis, primary billiary cirrhosis, myasthenia gravis, multiple sclerosis, systemic lupus erythematosis, psoriasis, atopic dermatitis, contact dermatitis, eczema, skin sunburn, vasculitis, chronic renal insufficiency, Stevens-Johnson syndrome, inflammatory pain, idiopathic sprue, cachexia, sarcoidosis, Guillain-Barré syndrome, uveitis, conjunctivitis, kerato conjunctivitis, otitis media, periodontal disease, pulmonary interstitial fibrosis, asthma, bronchitis, rhinitis, sinusitis, pneumoconiosis, pulmonary insufficiency syndrome, pulmonary emphysema, pulmonary fibrosis, silicosis, chronic inflammatory pulmonary disease and chronic obstructive pulmonary disease.

20. The method of claim 19 , wherein the Bruton's tyrosine kinase mediated disorder is selected from the group consisting of rheumatoid arthritis, psoriatic arthritis and osteoarthritis.

21. A compound according to Formula II, or a pharmaceutically acceptable salt thereof,

wherein:

A 1 , A 2 , A 3 , and A 4 are independently C, CH, CR 11 or N and bicyclic ring system E-G is selected from the group consisting of:

R 11 is independently selected from the group consisting of:

a) deuterium,

b) H,

c) halogen,

d) cyano,

e) —CH═CH 2 ,

f) —COOH,

g) —CO 2 (1-6C)alkyl,

h) —CO(1-6C)alkyl,

i) —CONH(1-6C)alkoxy,

j) —CONH(1-6C)alkyl,

k) —CON((1-6C)alkyl) 2 ,

l) (1-6C)alkyl,

m) (3-7C)cycloalkyl,

n) (1-6C)alkoxy,

o) (6-10C)aryl,

p) (1-5C)heteroaryl,

q) (2-6C)alkenyl,

r) (2-6C)alkynyl, and

s) (4-7C)heterocycloalkyl,

wherein

R 11 is optionally substituted with one or more groups selected from: halogen, (1-6C)alkyl, (1-5C)alkoxy, OH; or oxo;

R 12 is independently selected from the group consisting of H, (1-3C)alkyl, (1-3C)alkylNHC(O), and (1-3C)alkylOC(O);

wherein in aromatic ring K

B 1 , B 2 , B 3 , B 4 together are selected from the following groups:

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is)C(R 10 );

B 1 is N, B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is C(R 10 );

B 1 is C(R 7 ), B 2 is N B 3 is C(R 9 ), and B 4 is C(R 10 );

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is N, and B 4 is C(R 10 ); and

B 1 is C(R 7 ), B 2 is C(R 8 ), B 3 is C(R 9 ), and B 4 is N;

R 7 is H, halogen, OH, (1-3C)alkyl, (1-3C)alkoxy, halo(1-3C)alkyl, or CN; wherein any alkoxy may optionally be substituted with one, two or three halogens;

R 8 is H, halogen, OH, (1-3C)alkyl, (1-3C)alkoxy, halo(1-3C)alkyl, or CN; wherein any alkoxy may optionally be substituted with one, two or three halogens;

R 9 is H, halogen, OH, (1-3C)alkyl, (1-3C)alkoxy, halo(1-3C)alkyl, or CN; wherein any alkoxy may optionally be substituted with one, two or three halogens;

R 10 is H, halogen, OH, (1-3C)alkyl, (1-3C)alkoxy, halo(1-3C)alkyl, or CN; wherein any alkoxy may optionally be substituted with one, two or three halogens;

wherein in heteroaromatic ring L

W is CH or N;

X is CH, N, O or S;

Y is C(R 6 ), N, O or S;

Z is CH, N or a bond;

R 5 is H, halogen, CN, (1-4C)alkyl, (1-5C)alkoxy, (3-6C)cycloalkyl, or (3-6C)cycloalkoxy; wherein any alkyl, alkoxy, cycloalkyl or cycloalkoxy of R 5 may optionally be substituted with one, two or three halogens; or

R 5 is (6-10C)aryl, (1-5C)heteroaryl or (2-6C)heterocycloalkyl; wherein the aryl or heterocycloalkyl may optionally be substituted with halogen, (1-6C)alkyl, or (1-3C)alkoxy;

R 6 is H, halogen, CN, (1-6C)alkyl, or (1-6C)alkoxy; wherein any alkyl or alkoxy of R 6 may optionally be substituted with one, two or three halogens, or CN; or

R 5 and R 6 together may form a 5- to 6-membered fully saturated, partially unsaturated or aromatic carbocyclic or heterocyclic ring; or

R 5 and R 6 together may form (3-7C)cycloalkenyl or (2-6C)heterocycloalkenyl, wherein each may optionally be substituted with one or more halogens, or (1-3C)alkyl;

Q is C═O or C(R f ) 2 ;

T is C(R e ) 2 , O, NR e , or a bond;

U is C(R d ) 2 , O, or NR d ;

V is C(R g ) 2 , O, or a bond;

R c , R d , R e , and R f are each independently selected from H, halogen, (1-6C)alkyl, or OH; wherein any alkyl group of R c , R d , R e , or R f may optionally be substituted with OH; and

R g is independently selected from H, halogen, (1-6C)alkyl, (1-6C)alkoxy, halo(1-6C)alkyl, and OH;

with the proviso that:

1) up to 2 atoms of X, Y, and Z can simultaneously be a heteroatom;

2) when one atom selected from X or Y is O or S, then Z is a bond and the other atom selected from X or Y cannot be O or S;

3) when Z is CH or N, then Y is C(R 6 ) or N and X is CH, or N; and

5) when Q is C(R f ) 2 , then T is C(R e ) 2 .

22. A compound selected from the group consisting of:

4-{8-amino-3-[(6S,8aS)-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aR)-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-2-methyl-3-oxooctahydroimidazo[1,5-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(cyclopropyloxy)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-pyridin-2-ylbenzamide;

4-{8-amino-3-[(6S,8aR)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclobutylpyridin-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-3-[(6S,8aR)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-pyridin-2-ylbenzamide;

4-{8-amino-3-[(6S,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aR)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6S,8aR)-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(difluoromethyl)pyridin-2-yl]-3-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyanopyridin-2-yl)-3-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-3-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(difluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-ethylpyridin-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyrimidin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(1,1-difluoroethyl)pyridin-2-yl]-3-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-methyl-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(1,1-difluoroethyl)pyridin-2-yl]-2-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(difluoromethyl)pyridin-2-yl]-2-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-2-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-2-methylbenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(3-fluorooxetan-3-yl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(1-fluoro-1-methylethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-3-fluorobenzamide;

4-{8-amino-3-[(1S,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyanopyridin-2-yl)-2-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyanopyridin-2-yl)-3-methoxybenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyanopyridin-2-yl)-2-methylbenzamide;

4-{8-amino-3-[(1 S,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-3-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-3-methoxybenzamide;

4-{8-amino-3-[(7R,9aS)-4-oxooctahydropyrido[2,1-c][1,4]oxazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7S,9aR)-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-chloro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(cyclopropyloxy)pyridin-2-yl]-3-fluorobenzamide;

4-{8-amino-3-[(3 S,9aS)-6-oxooctahydro-2H-quinolizin-3-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(3R,9aR)-6-oxooctahydro-2H-quinolizin-3-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1 S,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)benzamide;

4-{8-amino-3-[(1 S,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-2-methyl-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7S,9aR)-2-methyl-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-1,1-dimethyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-3-methoxybenzamide;

4-{8-amino-3-[(7R,9aR)-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-octahydropyrido[2,1-c][1,4]oxazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7S,9aR)-octahydropyrido[2,1-c][1,4]oxazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7S,9aS)-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2S,6S,8aR)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2R,6R,8aS)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-(methylamino)-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-[(ethylcarbamoyl)amino]-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1S,6R,8aR)-1-methyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1 S,6R,8aR)-1-methyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-2-(2-hydroxyethyl)-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2R,6S,8aR)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2S,6R,8aS)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(benzyloxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(difluoromethoxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2S,6R,8aR)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2R,6S,8aS)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2R,6S,8aS)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(2S,6R,8aR)-2-hydroxy-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aR)-3-oxotetrahydro-1H-[1,3]oxazolo[4,3-c][1,4]oxazin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(3R,7R,9aS)-3-methyl-4-oxooctahydropyrido[2,1-c][1,4]oxazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(3E,6R,8aS)-3-(cyanoimino)octahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

methyl{3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]-1-(4-{[4-(trifluoromethyl)pyridin-2-yl]carbamoyl}phenyl)imidazo[1,5-a]pyrazin-8-yl}carbamate;

4-{8-amino-3-[(7R,9aS)-2-ethyl-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-2-(1-methylethyl)-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

methyl{(7R,9aS)-7-[8-amino-1-(4-{[4-(trifluoromethyl)pyridin-2-yl]carbamoyl}phenyl)imidazo[1,5-a]pyrazin-3-yl]-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-2-yl}acetate;

4-{8-amino-3-[(4aS,7R)-2-methyl-1-oxooctahydro-1H-pyrido[1,2-c]pyrimidin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(4aR,7S)-2-methyl-1-oxooctahydro-1H-pyrido[1,2-c]pyrimidin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-4-oxo-2-(pyridin-4-ylcarbonyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

2-{(7R,9aS)-7-[8-amino-1-(4-{[4-(trifluoromethyl)pyridin-2-yl]carbamoyl}phenyl)imidazo[1,5-a]pyrazin-3-yl]-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-2-yl}-2-methylpropanoic acid;

4-{8-amino-3-[(6R,8aS)-octahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-methyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-1,1-dimethyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(3R,8aR)-6-oxohexahydro-1H-pyrrolo[2,1-c][1,4]oxazin-3-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(4aS,7R)-1-oxohexahydro-3H-pyrido[1,2-c][1,3]oxazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(4aR,7S)-1-oxohexahydro-3H-pyrido[1,2-c][1,3]oxazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6S,8aR)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1 S,6R,8aS)-3-imino-1-methylhexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(1-hydroxyethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(1-hydroxy-1-methylethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(1-methoxyethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6S,8aR)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-4-oxo-2-(pyridin-4-ylcarbonyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

methyl-2-{[(4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}phenyl)carbonyl]amino}pyridine-4-carboxylate;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[5-(trifluoromethyl)pyridazin-3-yl]benzamide;

4-{8-amino-3-[(7R,9aS)-4-oxo-2-(phenylcarbonyl)octahydro-2H-pyrido[1,2-a]pyrazin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-isoquinolin-3-ylbenzamide;

4-{8-amino-3-[(3R,8aR)-6-oxohexahydro-1H-pyrrolo[2,1-c][1,4]oxazin-3-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

{(7R,9aS)-7-[8-amino-1-(4-{[4-(trifluoromethyl)pyridin-2-yl]carbamoyl}phenyl)imidazo[1,5-a]pyrazin-3-yl]-4-oxooctahydro-2H-pyrido[1,2-a]pyrazin-2-yl}acetic acid;

4-{8-amino-3-[(1 S,6R,8aS)-1-ethenyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(1R,6R,8aS)-1-ethenyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(4aR,7R)-2-methyl-1-oxooctahydro-1H-pyrido[1,2-c]pyrimidin-7-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-chloro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(1,1-difluoroethyl)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-ethoxy-2-fluoro-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-[(˜2˜H_3_)methyloxy]-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[5-cyano-4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-hydroxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

5-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]pyridine-2-carboxamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclopropyloxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[3-methyl-4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-cyano-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N˜1˜-[4-(trifluoromethyl)pyridin-2-yl]benzene-1,3-dicarboxamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[6-(1-methylethyl)-4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[6-cyclobutyl-4-(trifluoromethyl)pyridin-2-yl]benzamide;

2-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-{[4-(trifluoromethyl)pyridin-2-yl]carbamoyl}benzoic acid;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(6-methoxypyridin-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-fluoro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-fluoro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-ethoxy-2-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-5-ethoxy-2-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-5-ethoxy-2-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclohexyloxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(1-methylethoxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclobutyloxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclopentyloxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(2,2-dimethylpropoxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclopropyloxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclopropyloxy)-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclopropyloxy)-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclopropyloxy)-N-(4-cyclopropylpyridin-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(cyclopropyloxy)-N-(4-cyclopropylpyridin-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(azetidin-3-yloxy)-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-(cyclopropyloxy)-2-fluoro-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-ethoxy-2-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-ethoxy-2-fluoro-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

2-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-{[4-(trifluoromethyl)pyridin-2-yl]carbamoyl}phenyl acetate;

4-{8-(acetylamino)-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-hydroxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-hydroxy-N-(2-methoxyethyl)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazol[1,5-a]pyrazin-1-yl}-3-ethoxy-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-hydroxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-3-fluorobenzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-ethoxy-2-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[3-(trifluoromethyl)-1H-pyrazol-5-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-1H-imidazol-2-ylbenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[5-(trifluoromethyl)isoxazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[3-(trifluoromethyl)isoxazol-5-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(1,5-dimethyl-1H-pyrazol-3-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(3-methyl-1,2,4-thiadiazol-5-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)-1H-imidazol-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(3-ethyl-1,2,4-thiadiazol-5-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[3-(1-methylethyl)-1,2,4-thiadiazol-5-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[1-cyclopentyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(5-cyclopropyl-1-methyl-1H-pyrazol-3-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

ethyl-2-{[(4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}phenyl)carbonyl]amino}-4-(trifluoromethyl)-1,3-oxazole-5-carboxylate;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[1-ethyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methyl-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methyl-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-chloro-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-chloro-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-chloro-2-fluoro-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-chloro-2-fluoro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-chloro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-chloro-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-chloro-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-fluoro-5-methyl-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-fluoro-5-methyl-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(2-methoxyethoxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(2-hydroxyethoxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(2-ethoxyethoxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-(5-methyl-1,3-thiazol-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(but-3-yn-l 1-yloxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-methyl-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]-5-(trifluoromethyl)imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-ethylpyridin-2-yl)-3-methoxybenzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-(4-methoxypyridin-2-yl)benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclobutylpyridin-2-yl)-3-methoxybenzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-(5-methylpyridin-2-yl)benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]-5-(trifluoromethyl)imidazo[1,5-a]pyrazin-1-yl}-3-chloro-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]-5-(trifluoromethyl)imidazo[1,5-a]pyrazin-1-yl}-N-(4-cyclopropylpyridin-2-yl)-3-fluorobenzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]-5-(trifluoromethyl)imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-5-methyl-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]-5-(trifluoromethyl)imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-(1,1-difluoroethoxy)-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-2-chloro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-(8-amino-5-fluoro-3-((6R,8aS)-3-oxooctahydroindolizin-6-yl)imidazo[1,5-a]pyrazin-1-yl)-3-ethoxy-5-fluoro-N-(4-(trifluoromethyl)pyridin-2-yl)benzamide;

4-(8-amino-3-((6R,8aS)-1,1-dimethyl-3-oxooctahydroindolizin-6-yl)imidazo[1,5-a]pyrazin-1-yl)-3-ethoxy-N-(4-(trifluoromethyl)pyridin-2-yl)benzamide; and

4-(8-amino-3-((6R,8aS)-1,1-dimethyl-3-oxooctahydroindolizin-6-yl)imidazo[1,5-a]pyrazin-1-yl)-3-ethoxy-5-fluoro-N-(4-(trifluoromethyl)pyridin-2-yl)benzamide;

or pharmaceutically acceptable salts thereof.

23. A compound selected from the group consisting of:

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-1,1-dimethyl-3-oxohexahydro[1,3]oxazolo[3,4-a]pyridin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6S,8aR)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-2,2-dimethyl-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-5-ethoxy-2-fluoro-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-fluoro-5-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]benzamide;

4-{8-amino-5-chloro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-methoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-5-fluoro-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide;

4-{8-amino-3-[(6R,8aS)-3-oxooctahydroindolizin-6-yl]-5-(trifluoromethyl)imidazo[1,5-a]pyrazin-1-yl}-3-ethoxy-N-[4-(trifluoromethyl)pyridin-2-yl]benzamide; and

4-(8-amino-5-fluoro-3-((6R,8aS)-3-oxooctahydroindolizin-6-yl)imidazo[1,5-a]pyrazin-1-yl)-3-ethoxy-5-fluoro-N-(4-(trifluoromethyl)pyridin-2-yl)benzamide;

or a pharmaceutically acceptable salt thereof.