Cyanoisoquinoline compounds and methods of use thereof

1. A compound represented by formula I:

wherein:

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

R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, halo, cyano, hydroxyl, alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, amino, substituted amino, —OR 7 , —SR 7 , —SOR 7 , and —SO 2 R 7 wherein R 7 is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl;

R 5 and R 6 are independently selected from the group consisting of hydrogen or C 1-3 alkyl;

or a pharmaceutically acceptable salt, tautomer, or stereoisomer thereof; or an ester or amide of the carboxylic acid moiety on the glycine or alanine-based substituent of the cyanoisoquinoline ring.

2. The compound of claim 1 , wherein at least two of R 1 , R 2 , R 3 and R 4 are hydrogen.

3. The compound of claim 1 , wherein R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of hydrogen, hydroxyl, halo, substituted alkyl, aryl, —OR 7 , —SR 7 , and —SO 2 R 7 wherein R 7 is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl.

4. The compound of claim 1 , wherein R 1 , R 2 , R 3 , and R 4 are selected from the group consisting of hydrogen, halo, haloalkyl, alkyl, alkoxy, aryloxy and substituted aryloxy.

5. The compound of claim 3 , wherein R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of hydrogen, hydroxyl, phenyl, chloro, trifluoromethyl, benzyl, benzyloxy, methoxy, butoxy, isopropoxy, phenoxy, 4-fluorophenoxy, 2-methoxyphenoxy, 3-methoxyphenoxy, 4-methoxyphenoxy, 2,6-dimethylphenoxy, 2-ethyl-6-methylphenoxy, 2,4,6-trimethylphenoxy, 4-chloro-2,6-dimethylphenoxy, 4-propoxyphenoxy, 2,3-dihydro-benzofuran-5-yloxy, 2-methyl-benzothiazol-6-yloxy, 2-dimethylamino-benzooxazol-5-yloxy, 2-morpholin-4-yl-benzothiazol-6-yloxy, 2-methyl-benzooxazol-6-yloxy, benzo[1,3]dioxo-5-yloxy, phenylsulfanyl, phenylsulfonyl, and cyclohexyloxy.

6. The compound of claim 5 , wherein R 1 , R 2 , R 3 , and R 4 are selected from the group consisting of hydrogen, chloro, methoxy, trifluoromethyl, phenoxy, and 4-fluorophenoxy.

7. The compound of claim 5 , wherein R 1 and R 4 are hydrogen.

8. The compound of claim 5 , wherein R 1 , R 3 and R 4 are hydrogen.

9. The compound of claim 5 , wherein R 1 , R 2 and R 3 are hydrogen.

10. The compound of claim 5 , wherein R 1 , R 2 , and R 4 are hydrogen.

11. The compound of claim 5 , wherein R 2 , R 3 , and R 4 are hydrogen.

12. The compound of claim 5 , wherein R 1 , R 2 , R 3 , and R 4 are hydrogen.

13. The compound of claim 11 , where R 1 is selected from the group consisting of phenyl, phenoxy and 4-fluorophenoxy.

14. The compound of claim 1 , wherein R 2 is selected from the group consisting of halo, cyano, hydroxyl, alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, amino, substituted amino, —OR 7 , —SR 7 , —SOR 7 , and —SO 2 R 7 wherein R 7 is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl.

15. The compound of claim 14 , wherein R 2 is selected from the group consisting of halo, —OR 7 , —SR 7 , —SOR 7 , and —SO 2 R 7 wherein R 7 is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl.

16. The compound of claim 14 , wherein R 2 is selected from the group consisting of chloro, methoxy, isopropoxy, phenoxy, 4-fluorophenoxy, 4-methoxyphenoxy, 2,6-dimethylphenoxy, 2-ethyl-6-methylphenoxy, 2,4,6-trimethylphenoxy, 4-chloro-2,6-dimethylphenoxy, 4-propoxyphenoxy, 2,3-dihydro-benzofuran-5-yloxy, 2-methyl-benzothiazol-6-yloxy, 2-dimethylamino-benzooxazol-5-yloxy, 2-morpholin-4-yl-benzothiazol-6-yloxy, 2-methyl-benzooxazol-6-yloxy, benzo[1,3]dioxo-5-yloxy, phenylsulfonyl, phenylsulfanyl, and cyclohexyloxy.

17. The compound of claim 14 , wherein R 2 is methoxy, phenoxy, or 4-fluorophenoxy.

18. The compound of claim 1 , wherein R 3 is selected from the group consisting of hydroxyl, halo, haloalkyl, substituted alkyl, —OR 7 , —SR 7 , —SOR 7 , and —SO 2 R 7 wherein R 7 is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl.

19. The compound of claim 18 , wherein R 3 is selected from the group consisting of trifluoromethyl, chloro, hydroxyl, benzyl, methoxy, isopropoxy, butoxy, benzyloxy, phenoxy, 4-fluorophenoxy, 2,6-dimethylphenoxy, 4-methoxyphenoxy, 2-dimethylamino-benzooxazol-5-yloxy, benzo[1,3]dioxo-5-yloxy, and phenylsulfanyl.

20. The compound of claim 18 , wherein R 3 is phenoxy, 4-fluorophenoxy, trifluoromethyl, or chloro.

21. The compound of claim 1 , wherein R 4 is selected from the group consisting of phenyl, phenoxy, 2-methoxyphenoxy, 3-methoxyphenoxy, 4-methoxyphenoxy, and 4-fluorophenoxy.

22. The compound of claim 21 , wherein R 4 is phenoxy or 4-fluorophenoxy.

23. The compound of claim 1 , wherein R 5 is hydrogen.

24. The compound of claim 1 , wherein R 5 is methyl.

25. The compound of claim 1 , wherein R 6 is hydrogen.

26. The compound of claim 1 , wherein R 6 is methyl.

27. The compound of claim 1 , wherein R is hydrogen.

28. The compound of claim 1 , wherein R is methyl.

29. The compound of claim 1 , wherein the compound is of formula II:

wherein:

R 31 , R 32 , R 33 and R 34 are independently selected from the group consisting of hydrogen, cyano, hydroxyl, halo, alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, amino, substituted amino, —OR 37 , —SR 37 , —SOR 37 , and —SO 2 R 37 wherein R 37 is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl;

R 35 is hydrogen or methyl;

or a pharmaceutically acceptable salt, tautomer, or stereoisomer thereof; or an ester or amide of the carboxylic acid moiety on the glycine- or alanine-based substituent of the cyanoisoquinoline ring.

30. The compound of claim 29 , wherein at least three of R 31 , R 32 , R 33 , and R 34 are hydrogen.

31. The compound of claim 29 , wherein R 31 , R 32 , R 33 and R 34 are independently selected from the group consisting of hydrogen, halo, hydroxy, alkyl, substituted alkyl, haloalkyl, alkoxy, substituted alkoxy, aryl, substituted aryl, aryloxy, substituted aryloxy, heteroaryloxy, substituted heteroaryloxy, cycloalkoxy, substituted cycloalkoxy, amino, and substituted amino; and

R 35 is hydrogen or methyl.

32. The compound of claim 29 , wherein R 31 , R 32 , R 33 and R 34 are independently selected from the group consisting of hydrogen, substituted alkyl, aryl, aryloxy, and substituted aryloxy; and

R 35 is hydrogen or methyl.

33. A compound selected from the group consisting of:

{[1-cyano-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

2-(S)-[(1-cyano-4-hydroxy-isoquinoline-3-carbonyl)-amino]-propionic acid,

{[1-cyano-4-hydroxy-7-phenoxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

2-(S)-[(1-cyano-4-hydroxy-7-phenoxy-isoquinoline-3-carbonyl)-amino]-propionic acid,

2-(R)-[(1-cyano-4-hydroxy-7-phenoxy-isoquinoline-3-carbonyl)-amino]-propionic acid,

{[1-cyano-7-(4-fluorophenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-7-(trifluoromethyl)-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-7-chloro-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-8-phenoxy-isoquinoline-3-carbonyl]amino}-acetic acid,

{[1-cyano-8-(4-fluoro-phenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

[(1-cyano-4-hydroxy-6-methoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-6-phenoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

{[1-cyano-6-(4-fluoro-phenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-6-(4-methoxy-phenoxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

[(1-cyano-4-hydroxy-6-phenylsulfanyl-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-7-phenylsulfanyl-isoquinoline-3-carbonyl)-amino]-acetic acid,

{[1-cyano-6-(2,6-dimethyl-phenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

[(1-cyano-4-hydroxy-5-phenoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

{[1-cyano-4-hydroxy-8-(4-methoxy-phenoxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-8-(3-methoxy-phenoxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-8-(2-methoxy-phenoxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

[(7-benzyl-1-cyano-4-hydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

{[1-cyano-5-(4-fluoro-phenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-7-(2,6-dimethyl-phenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-6-(2-ethyl-6-methyl-phenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-6-(2,4,6-trimethyl-phenoxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[6-(4-chloro-2,6-dimethyl-phenoxy)-1-cyano-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-7-(4-methoxy-phenoxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

[(1-cyano-6-cyclohexyloxy-4-hydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(6-benzenesulfonyl-1-cyano-4-hydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

{[1-cyano-4-hydroxy-6-(4-propoxy-phenoxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[7-(benzo[1,3]dioxol-5-yloxy)-1-cyano-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[6-(benzo[1,3]dioxol-5-yloxy)-1-cyano-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-6-(2,3-dihydro-benzofuran-5-yloxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

[(1-cyano-4-methoxy-8-phenoxy-isoquinoline-3-carbonyl)-amino]-acetic acid methyl ester,

[(1-cyano-4-methoxy-8-phenoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

(S)-2-[(1-cyano-4-hydroxy-8-phenoxy-isoquinoline-3-carbonyl)-amino]-propionic acid,

(R)-2-[(1-cyano-4-hydroxy-8-phenoxy-isoquinoline-3-carbonyl)-amino]-propionic acid,

{[1-cyano-4-hydroxy-6-(2-methyl-benzothiazol-6-yloxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-6-(2-dimethylamino-benzooxazol-5-yloxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-7-(2-dimethylamino-benzooxazol-5-yloxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-6-(2-morpholin-4-yl-benzothiazol-6-yloxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

{[1-cyano-4-hydroxy-6-(2-methyl-benzooxazol-6-yloxy)-isoquinoline-3-carbonyl]-amino}-acetic acid,

[(6-chloro-1-cyano-4-hydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(7-butoxy-1-cyano-4-hydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-6,7-diphenoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-7-methoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-7-isopropoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-6-isopropoxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-5-phenyl-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(1-cyano-4-hydroxy-8-phenyl-isoquinoline-3-carbonyl)-amino]-acetic acid,

[(7-benzyloxy-1-cyano-4-hydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

and [(1-cyano-4,7-dihydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid,

or a pharmaceutically acceptable salt, tautomer, or stereoisomer thereof; or an ester or amide of the carboxylic acid moiety on the glycine- or alanine-based substituent of the cyanoisoquinoline ring.

34. A pharmaceutical composition comprising one or more compounds of claim 1 and a pharmaceutically acceptable excipient.

35. The composition of claim 34 , further comprising at least one additional therapeutic agent.

36. The composition of claim 35 , wherein the agent is selected from the group consisting of vitamin B12, folic acid, ferrous sulfate, human erythropoietin and an erythropoiesis stimulating protein (ESP).