Tricyclic pyrazole kinase inhibitors

1. A compound of formula (I)

or a therapeutically acceptable salt thereof, wherein

X 1 is selected from the group consisting of C and N;

X 2 is selected from the group consisting of CH 2 , C═O, and O;

R A , R B , and R C are independently selected from the group consisting of hydrogen, alkoxyalkoxy, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonyl, carboxy, halogen, heteroaryl, heteroarylalkoxy, heteroarylalkyl, heteroarylcarbonyl, heteroaryloxy, heterocycle, heterocyclealkoxy, heterocyclealkyl, heterocyclecarbonyl, heterocycleoxy, R a R b N—, (R a R b N)alkoxy, (R a R b N)alkyl, (R a R b N)carbonyl, and (NR a R b N)carbonylalkoxy, and (R a R b N)carbonylalkyl;

R D is absent or selected from the group consisting of hydrogen, alkoxyalkoxy, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonyl, carboxy, halogen, heteroaryl, heteroarylalkoxy, heteroarylalkyl, heteroarylcarbonyl, heteroaryloxy, heterocycle, heterocyclealkoxy, heterocyclealkyl, heterocyclecarbonyl, heterocycleoxy, R a R b N—, (R a R b N)alkoxy, (R a R b N)alkyl, (R a R b N)carbonyl, and (NR a R b N)carbonylalkoxy, and (R a R b N)carbonylalkyl;

R a and R b are independently selected from the group consisting of hydrogen, alkoxyalkyl, alkyl, alkylcarbonyl, formyl, heteroarylalkyl, heterocyclealkyl, and (Z 1 Z 2 N)alkyl;

Z 1 and Z 2 are independently selected from the group consisting of hydrogen, alkyl, formyl, and alkylcarbonyl;

R 4 is selected from the group consisting of heteroaryl, C≡CR 5 , (CH 2 ) n NR 6 C(O)NR 7 R 8 , (CH 2 ) n NR 6 C(O)OR 8 , (CH 2 ) n NR 6 C(NCN)NR 7 R 8 , (CH 2 ) n OC(O)NR 7 R 8 , CH═NNR 6 C(O)NR 7 R 8 , CH═NOR 8 , and CH═NOCH 2 C(O)NR 7 R 8 ;

n is 1, 2, 3, 4, or 5;

R 5 is selected from the group consisting of alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonylalkoxyalkyl, alkyl, aryl, aryloxyalkyl, arylthioalkyl, arylsulfinylalkyl, arylsulfonylalkyl, cycloalkyl, cycloalkylalkoxyalkyl, cycloalkylalkyl, cycloalkyloxyalkyl, haloalkoxyalkyl, haloalkoxyalkoxyalkyl, heteroaryl, heteroarylalkoxyalkyl, heteroarylalkyl, heteroaryloxyalkyl, heterocycle, heterocyclealkoxyalkyl, heterocyclealkyl, heterocyclecarbonylalkyl, heterocyclecarbonyloxyalkyl, heterocycleoxyalkyl, (NR a R b )carbonylalkoxyalkyl, (NR c R d )alkyl, (CH 2 ) n NR 6 C(O)NR 7 R 8 , (CH 2 ) n NR 6 C(O)OR 8 , (CH 2 ) n NR 6 C(NCN)NR 7 R 8 , (CH 2 ) n OC(O)NR 7 R 8 , and CH═NNR 6 C(O)NR 7 R 8 ;

R c is selected from the group consisting of hydrogen and alkyl;

R d is selected from the group consisting of alkylsulfonyl, arylsulfonyl, heteroarylcarbonyl, and heteroarylcarbonyl;

R 6 and R 7 are each independently selected from the group consisting of hydrogen, alkoxy, alkoxyalkyl, alkyl, aryl, arylalkyl, cycloalkyl, and cycloalkylalkyl; and

R 8 is selected from the group consisting of hydrogen, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonylalkoxyalkyl, alkoxycarbonylalkyl, alkyl, aryl, arylalkoxyalkyl, arylalkyl, aryloxyalkyl, arylthioalkyl, arylsulfinylalkyl, arylsulfonylalkyl, cyanoalkyl, cycloalkyl, cycloalkylalkyl, haloalkoxyalkoxyalkyl, haloalkoxyalkyl, haloalkyl, heteroaryl, heteroarylalkoxyalkyl, heteroarylalkyl, heteroaryloxyalkyl, heterocycle, heterocyclealkoxyalkyl, heterocyclecarbonylalkyl, heterocyclecarbonyloxyalkyl, heterocycleoxyalkyl, heterocyclealkyl, hydroxyalkyl, (R a R b N)alkyl, (R a R b N)carbonylalkoxyalkyl, and (R a R b N)carbonylalkyl; or

R 7 and R 8 , together with the nitrogen atom to which they are attached, form a heterocycle ring selected from the group consisting of piperazine, piperidine, and morpholine.

2. The compound of claim 1 wherein R 4 is (CH 2 ) n NR 6 C(O)NR 7 R 8 .

3. The compound of claim 1 wherein R 4 is (CH 2 ) n NR 6 C(O)OR 8 .

4. The compound of claim 1 wherein R 4 is (CH 2 ) n NR 6 C(NCN)NR 7 R 8 .

5. The compound of claim 1 wherein R 4 is (CH 2 ) n OC(O)NR 7 R 8 .

6. The compound of claim 1 wherein R 4 is CH═NNR 6 C(O)NR 7 R 8 .

7. The compound of claim 1 wherein R 4 is CH═NOR 8 .

8. The compound of claim 1 wherein R 4 is CH═NOCH 2 C(O)NR 7 R 8 .

9. The compound of claim 1 wherein R 4 is C≡CR 5 .

10. The compound of claim 1 wherein

X 1 is selected from the group consisting of C and N;

X 2 is selected from the group consisting of CH 2 and O;

R A is hydrogen;

R B is selected from the group consisting of heteroaryl, heteroarylalkoxy, heteroarylalkyl, heteroarylcarbonyl, heteroaryloxy, heterocycle, heterocyclealkoxy, heterocyclealkyl, heterocyclecarbonyl, heterocycleoxy, R a R b N—, (R a R b N)alkoxy, (R a R b N)alkyl, (R a R b N)carbonyl, (NR a R b N)carbonylalkoxy, and (R a R b N)carbonylalkyl;

R C is selected from the group consisting of hydrogen, alkoxyalkoxy, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonyl, carboxy, and halogen;

R D is absent or selected from the group consisting of hydrogen and halogen;

R a and R b are independently selected from the group consisting of hydrogen, alkoxyalkyl, alkyl, alkylcarbonyl, formyl, heteroarylalkyl, heterocyclealkyl, and (Z 1 Z 2 N)alkyl;

Z 1 and Z 2 are independently selected from the group consisting of hydrogen, alkyl, formyl, and alkylcarbonyl;

R 4 is C≡CR 5 ;

R 5 is selected from the group consisting of alkoxyalkoxyalkyl, alkoxycarbonylalkoxyalkyl, arylthioalkyl, arylsulfinylalkyl, arylsulfonylalkyl, cycloalkyl, cycloalkylalkoxyalkyl, cycloalkylalkyl, cycloalkyloxyalkyl, haloalkoxyalkoxyalkyl, heteroaryl, heteroaryloxyalkyl, heterocycle, heterocyclecarbonylalkyl, heterocyclecarbonyloxyalkyl, heterocycleoxyalkyl, (NR a R b )carbonylalkoxyalkyl, (NR c R d )alkyl;

R c is selected from the group consisting of hydrogen and alkyl; and

R d is selected from the group consisting of alkylsulfonyl, arylsulfonyl, heteroarylcarbonyl, and heteroarylcarbonyl.

11. The compound of claim 1 wherein

X 1 is selected from the group consisting of C and N;

X 2 is selected from the group consisting of CH 2 and O;

R A is hydrogen;

R B is selected from the group consisting of hydrogen, alkoxyalkoxy, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonyl, carboxy, and halogen;

R C is selected from the group consisting of heteroaryl, heteroarylalkoxy, heteroarylalkyl, heteroarylcarbonyl, heteroaryloxy, heterocycle, heterocyclealkoxy, heterocyclealkyl, heterocyclecarbonyl, heterocycleoxy, R a R b N—, (R a R b N)alkoxy, (R a R b N)alkyl, (R a R b N)carbonyl, (NR a R b N)carbonylalkoxy, and (R a R b N)carbonylalkyl;

R D is absent or selected from the group consisting of hydrogen and halogen;

R a and R b are independently selected from the group consisting of hydrogen, alkoxyalkyl, alkyl, alkylcarbonyl, formyl, heteroarylalkyl, heterocyclealkyl, and (Z 1 Z 2 N)alkyl;

Z 1 and Z 2 are independently selected from the group consisting of hydrogen, alkyl, formyl, and alkylcarbonyl;

R 4 is C≡CR 5 ;

R 5 is selected from the group consisting of alkoxyalkoxyalkyl, alkoxycarbonylalkoxyalkyl, arylthioalkyl, arylsulfinylalkyl, arylsulfonylalkyl, cycloalkyl, cycloalkylalkoxyalkyl, cycloalkylalkyl, cycloalkyloxyalkyl, haloalkoxyalkoxyalkyl, heteroaryl, heteroaryloxyalkyl, heterocycle, heterocyclecarbonylalkyl, heterocyclecarbonyloxyalkyl, heterocycleoxyalkyl, (NR a R b )carbonylalkoxyalkyl, (NR c R d )alkyl;

R c is selected from the group consisting of hydrogen and alkyl; and

R d is selected from the group consisting of alkylsulfonyl, arylsulfonyl, heteroarylcarbonyl, and heteroarylcarbonyl.

12. The compound of claim 1 wherein R 4 is C≡CR 5 ; and R 5 is selected from the group consisting of alkoxyalkoxyalkyl and haloalkoxyalkoxyalkyl.

13. The compound of claim 1 wherein R 4 is C≡CR 5 ; R 5 is selected from the group consisting of alkoxyalkoxyalkyl and haloalkoxyalkoxyalkyl; R B is selected from the group consisting of heteroarylalkyl and heterocyclealkyl; and R A , R C , R D , R 2 , and R 3 are hydrogen.

14. The compound according to claim 13 selected from the group consisting of

3-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-7-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole;

7-(1H-imidazol-1-ylmethyl)-3-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-ethoxyethoxy)-1-propynyl]-3-thienyl}-7-(1H-1,2,4-triazol-1-ylmethyl)-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-isopropoxyethoxy)-1-propynyl]-3-thienyl}-7-(1H-1,2,4-triazol-1-ylmethyl)-1,4-dihydroindeno[1,2-c]pyrazole;

-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-7-(1H-1,2,4-triazol-1-ylmethyl)-1,4-dihydroindeno[1,2-c]pyrazole;

3-{4-[3-(2-methoxyethoxy)-1-propynyl]-2-thienyl}-7-(1H-1,2,4-triazol-1-ylmethyl)-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-isopropoxyethoxy)-1-propynyl]-3-thienyl}-7-(1H-1,2,3-triazol-1-ylmethyl)-1,4-dihydroindeno[1,2-c]pyrazole; and

3-{5-[3-(2-isopropoxyethoxy)-1-propynyl]-3-thienyl}-7-(2H-1,2,3-triazol-2-ylmethyl)-1,4-dihydroindeno[1,2-c]pyrazole.

15. The compound of claim 1 wherein R 4 is C≡CR 5 ; R 5 is selected from the group consisting of alkoxyalkoxyalkyl and haloalkoxyalkoxyalkyl; R C is selected from the group consisting of heteroarylalkyl and heterocyclealkyl; and R A , R B , R D , R 2 , and R 3 are hydrogen.

16. The compound according to claim 15 selected from the group consisting of

3-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-isopropoxyethoxy)-1-propynyl]-3-thienyl}-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-ethoxyethoxy)-1-propynyl]-3-thienyl}-6-[(4-methyl-1-piperazinyy)methyl]-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-isobutoxyethoxy)-1-propynyl]-3-thienyl}-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-methoxy-1-methylethoxy)-1-propynyl]-3-thienyl}-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole;

6-[(4-isopropyl-1-piperazinyl)methyl]-3-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-1,4-dihydroindeno[1,2-c]pyrazole;

6-[(4-ethyl-1-piperazinyl)methyl]-3-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-1,4-dihydroindeno[1,2-c]pyrazole;

6-(1H-imidazol-1-ylmethyl)-3-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-methoxyethoxy)-1-propynyl]-3-thienyl}-6-(1H-1,2,4-triazol-1-ylmethyl)-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-ethoxyethoxy)-1-propynyl]-2-thienyl}-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole;

3-{5-[3-(2-isopropoxyethoxy)-1-propynyl]-2-thienyl}-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole; and

3-{4-[3-(2-methoxyethoxy)-1-propynyl]-2-thienyl}-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole.

17. The compound according to claim 9 which is 3-(5-{3-[2-(difluoromethoxy)ethoxy]-1-propynyl}-3-thienyl)-6-[(4-methyl-1-piperazinyl)methyl]-1,4-dihydroindeno[1,2-c]pyrazole.

18. The compound according to claim 1 selected from the group consisting of

3-[5-(3-Cyclopropylmethoxy-prop-1-ynyl)-thiophen-3-yl]-7-fluoro-6-(4-methyl-piperazin-1-yl)-1,4-dihydro-indeno[1,2-c]pyrazole;

1-{3-[5-(3-Cyclopropylmethoxy-prop-1-ynyl)-thiophen-3-yl]-1,4-dihydro-indeno[1,2-c]pyrazol-6-ylmethyl}-4-methyl-piperazin-2-one;

6-(4-Cyclopropyl-piperazin-1-yl)-3-{5-[3-(2-fluoro-ethoxy)-prop-1-ynyl]-thiophen-3-yl}-1,4-dihydro-indeno[1,2-c]pyrazole;

3-[5-(3-Isopropoxy-prop-1-ynyl)-thiophen-3-yl]-6-(4-methyl-piperazin-1-yl)-1,4-dihydro-indeno[1,2-c]pyrazole; and

6-(4-cyclopropylpiperazin-1-yl)-3-[5-(3-isopropoxyprop-1-ynyl)thien-3-yl]-1,4-dihydroindeno[1,2-c]pyrazole.

19. A pharmaceutical composition comprising a compound of formula (I) or a therapeutically acceptable salt thereof, in combination with a therapeutically acceptable carrier.

20. A method for inhibiting a protein kinase in a patient in recognized need of such treatment comprising administering to the patient a therapeutically acceptable amount of a compound of formula (I), or a therapeutically acceptable salt thereof.