IDO inhibitors

1. A compound of formula I

wherein:

Y is N, CH or CF;

V is N, CH or CF;

R 1 is —COOH, —COOC 1 -C 6 alkyl, —CONH 2 , —CN, optionally substituted 5 or 6 membered heterocyclyl having 1-4 ring vertices independently selected from O, N, S, 5 or 6 membered optionally substituted heteroaryl having 1-4 ring vertices independently selected from O, N, S, —NHCONHR 13 , —CONHSO 2 R 14 , —CONHCOR 13 , —SO 2 NHCOR 13 , —CONR 13 , —CONHSO 2 NR 13 R 14 , —SO 2 NHR 13 , —NHCONHSO 2 R 13 , —CHCF 3 OH, —COCF 3 , —CR 2 R 3 OH, or —NHSO 2 R 13 ;

R 13 is H, optionally substituted C 1 -C 10 alkyl, optionally substituted C 3 -C 8 cycloalkyl, optionally substituted C 2 -C 10 alkenyl, optionally substituted C 2 -C 10 alkynyl, optionally substituted 5-6 membered heterocyclyl having 1-4 ring vertices independently selected from O, N, S, optionally substituted phenyl, or optionally substituted 5-6 membered heteroaryl having 1-4 vertices independently selected from O, N, S;

R 14 is H, optionally substituted C 1 -C 10 alkyl, phenyl, or C 3-8 cycloalkyl;

R 2 and R 3 are independently -hydrogen, optionally substituted C 1 -C 10 alkyl, optionally substituted C 3-8 cycloalkyl, or optionally substituted phenyl; or

R 2 and R 3 are taken together with the carbon to which they are attached to form an optionally substituted 3- to 6-membered carbocyclic or heterocyclic ring;

R 4 and R 5 are independently H, optionally substituted C 1 -C 10 alkyl, optionally substituted C 1 -C 10 -alkoxy-C 1 -C 10 -alkyl, optionally substituted C 1 -C 10 alkoxy, optionally substituted aryl, optionally substituted aryl-C 1 -C 10 -alkyl, optionally substituted 5- to 8-membered heteroaryl containing 0-3 heteroatoms selected form N, S and O, optionally substituted C 3 -C 8 cycloalkyl or optionally substituted heterocyclyl containing 0-3 heteroatoms selected form N, S and O; or

R 4 and R 5 are taken together with the nitrogen to which they are attached to form a 4- to 8-membered optionally substituted heterocyclic ring containing 0-3 additional heteroatoms selected from —N—, —S— and —O—; or

R 4 and R 5 are taken together with the nitrogen to which they are attached to form a 6- to 10-membered optionally substituted heterobicyclic ring containing 0-3 additional heteroatoms selected from —N—, —S—, and —O—;

R 6 is optionally substituted 5 or 6 membered aryl, optionally substituted 5 or 6 membered heteroaryl having 1 to 4 ring vertices selected from O, N, S, optionally substituted C 3 -C 8 cycloalkyl optionally substituted 9 to 10 membered fused bicyclic heterocyclyl having 1 to 4 ring vertices independently selected from O, N, S, 9 to 10 membered fused bicyclic heteroaryl having 1 to 4 vertices independently selected from O, N, S or —COR 7 ;

R 7 is optionally substituted —CR 2 R 3 — 5 or 6 membered aryl, optionally substituted —CR 2 R 3 — 5 or 6 membered heteroaryl, —CR 2 R 3 — 3 to 6 membered heterocyclyl, optionally substituted 5 or 6 membered aryl, optionally substituted 5 or 6 membered heteroaryl, optionally substituted C 3 -C 8 cycloalkyl, or optionally substituted 3 to 6 membered heterocyclyl; and

R x and R y are each independently H, optionally substituted C 1 -C 10 alkyl, optionally substituted C 1 -C 10 alkoxy, or optionally substituted C 3 -C 8 cycloalkyl; or

R x and R y are taken together with the carbon to which they are attached to form a 3- to 7-membered heterocyclic ring containing 0-3 additional heteroatoms selected from —N—, —S— and —O—;

and/or a stereoisomer, a tautomer or a pharmaceutically acceptable salt thereof.

2. The compound according to claim 1 wherein R x and R y are H, methyl, or methoxy.

3. The compound according to claim 1 wherein R 2 and R 3 are each independently H, methyl, ethyl, methoxymethyl, haloalkyl, or alkoxy.

4. The compound according to claim 1 , wherein R 1 is —COOH, —CONHSO 2 R 14 , —NHSO 2 R 14 , —CHCF 3 OH, or is selected from the group consisting of

5. The compound according to claim 4 , wherein R 1 is —COOH, —CONHSO 2 R 14 , —NHSO 2 R 14 , —CHCF 3 OH,

6. The compound according to claim 5 wherein R 1 is —COOH.

7. The compound according to claim 1 wherein:

R 4 is optionally substituted C 1 to C 6 alkyl, optionally substituted C 3 to C 6 cycloalkyl; or selected from the group consisting of optionally substituted tetrahydropyranyl, optionally substituted azetidinyl, optionally substituted morpholinyl, optionally substituted piperidinyl, optionally substituted pyrrolidinyl, optionally substituted piperazinyl, or an optionally substituted heterocyclic ring selected from

8. The compound according to claim 1 , wherein R 5 is —H, optionally substituted C 1 to C 6 alkyl, or optionally substituted C 3 to C 6 cycloalkyl.

9. The compound according to claim 1 , wherein R 4 is C 1 to C 6 alkyl optionally substituted with hydroxyl; C 3 to C 6 cycloalkyl, optionally substituted with at least one of C 1 to C 6 alkyl, hydroxyl, and/or alkoxy; azetidinyl optionally substituted with hydroxyl, halo, or alkoxy; tetrahydropyranyl; morpholinyl optionally substituted with at least one of at least one of C 1 to C 6 alkyl and/or phenyl; piperidinyl optionally substituted with at least one of C 1 to C 6 alkyl, phenyl and/or benzyl; cyclohexyl; pyrrolidinyl optionally substituted with at least one of —OH, hydroxyalkyl, methoxyalkyl and/or haloalkyl; piperazinyl optionally substituted with at least one of C 1 to C 4 alkyl and/or —COOR 13 ;

optionally substituted with phenyl, —COOR 13 , alkyl, haloalkyl, or benzyl.

10. The compound according to claim 1 , wherein R 4 is optionally substituted C 1 to C 6 alkyl.

11. The compound according to claim 1 , wherein R 4 is optionally substituted tetrahydropyranyl.

12. The compound according to claim 1 wherein R 4 is optionally substituted morpholinyl.

13. The compound according to claim 1 wherein R 4 is optionally substituted piperidinyl.

14. The compound according to claim 1 wherein R 4 is optionally substituted pyrrolidinyl.

15. The compound according to claim 1 , wherein R 4 and R 5 are taken together with the nitrogen to which they are attached to form an optionally substituted heterocyclyl selected from the group consisting of morpholinyl, piperidinyl, azetidinyl, piperazinyl,

16. The compound according to claim 1 , wherein R 6 is optionally substituted phenyl; optionally substituted pyrimidinyl; optionally substituted pyridyl; optionally substituted pyrazinyl, optionally substituted pyridazinyl, an optionally substituted heterocyclic ring selected from the group consisting of

or —COR 7 wherein R 7 is optionally substituted benzyl, —CF 2 phenyl, —CH 2 -isoxalyl, or optionally substituted phenyl.

17. The compound according to claim 1 , wherein R 6 is phenyl optionally substituted with from 1 to 3 substituents selected from C 1 to C 6 alkyl, —CN, halo, alkoxy, haloalkoxy, and/or —SO 2 -alkyl.

18. The compound according to claim 1 , wherein R 6 is pyrimidinyl optionally substituted with at least one of C 1 to C 6 alkyl, C 1 to C 6 alkoxy, —CN, and/or amino.

19. The compound according to claim 1 , wherein R 6 is pyridyl, optionally substituted with at least one of alkoxy, amino, and/or CONH 2 .

20. The compound according to claim 1 , wherein:

Y is CH or CF;

V is CH or CF;

R 1 is —COOH;

R 2 and R 3 are independently hydrogen, optionally substituted C 1 to C 6 alkyl, C 3 to C 6 cycloalkyl, phenyl, or R 2 and R 3 join together with the carbon to which they are attached to form tetrahydropyranyl;

R 4 is H, optionally substituted C 1 to C 6 alkyl, tetrahydropyranyl, optionally substituted cyclohexyl,

 optionally substituted piperazinyl, optionally substituted piperidinyl, optionally substituted pyrrolidinyl, optionally substituted diazabicycloheptanyl, or furanyl; or

R 4 and R 5 are taken together with the nitrogen to which they are attached to form optionally substituted morpholinyl, optionally substituted piperidinyl, optionally substituted piperazinyl, optionally substituted

 or optionally substituted pyrrolidinyl; and

R 6 is optionally substituted phenyl, optionally substituted pyrimidinyl, morpholinyl, or —COR 7 wherein R 7 is optionally substituted phenyl.

21. A compound that is

(S)-3-(4-((1,1-dioxidotetrahydro-2H-thiopyran-4-yl)(isobutyl)amino)-3-((2-methylbenzo[d]thiazol -5-yl)amino)phenyl)pentanoic acid;

(S)-3-(3-((2,2-difluorobenzo[d][1,3] dioxol-5-yl)amino)-4-((1,1-dioxidotetrahydro -2H-thiopyran-4-yl)(isobutyl)amino)phenyl)pentanoic acid;

(S)-3-(4-(cyclohexyl(2-hydroxy-2-methylpropyl)amino)-3-((4-fluorophenyl) amino)phenyl)pentanoic acid;

(S)-3-(4-(cyclohexyl(2-hydroxy-2-methylpropyl)amino)-3-((4-difluoromethody)phenyl)amino)phenyl)pentanoic acid;

(S)-3-(3-((4-cyanophenyl)amino)-4-(cyclohexyl(2-hydroxy-2-methylpropyl) amino)phenyl)pentanoic acid;

(S)-3-(4-(cyclohexyl(2-hydroxy-2-methylpropyl)amino)-3-((4-ethylphenyl) amino)phenyl)pentanoic acid;

(S)-3-(4-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-3-(p-tolylamino)phenyl)-4-methoxybutanoic acid;

(S)-3-(4-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-3-((4-ethylphenyl)amino)phenyl)-4-methoxybutanoic acid;

(S)-3-(4-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-3-((4-fluorophenyl)amino)phenyl)-4-methoxybutanoic acid;

(S)-3-(3-((4-chlorophenyl) amino)-4-(ethyl(tetrahydro-2H-pyran-4-yl)amino) phenyl)-4-methoxybutanoic acid;

3-(3-((4-chlorophenyl) amino)-4-(cyclohexyl (isobutyl)amino)phenyl) pentanoic acid;

3-(4-(cyclohexyl(isobutyl) amino)-3-((4-ethylphenyl) amino)phenyl)pentanoic acid;

3-(3-((4-chloro-3-fluorophenyl)amino)-4-(cyclohexyl(isobutyl) amino)phenyl)pentanoic acid;

3-(4-(cyclohexyl(isobutyl) amino)-3-((4-fluorophenyl) amino)phenyl)pentanoic acid;

3-(4-(cyclohexyl(isobutyl) amino)-3-((4-(trifluoromethoxy)phenyl) amino)phenyl)pentanoic acid;

3-(4-(cyclohexyl(isobutyl) amino)-3-((4-ethoxyphenyl)amino) phenyl)pentanoic acid;

3-(3-((4-cyanophenyl) amino)-4-(cyclohexyl (isobutyl)amino)phenyl) pentanoic acid;

(R)-3-(3-((2-Ethoxypyrimidin-5-yl)amino)-4-(ethyl(tetrahydro-2H-pyran-4-yl) amino)phenyl)pentanoic acid;

(R)-3-(3-((4-ethoxyphenyl) amino)-4-(ethyl (tetrahydro-2H-pyran-4-yl)amino)phenyl)pentanoic acid;

(R)-3-(4-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-3-((4-(2,2,2-trifluoroethoxy) phenyl)amino)phenyl)pentanoic acid;

(R)-3-(3-((4-(cyclopropylmethoxy) phenyl)amino)-4-(ethyl(tetrahydro-2 H-pyran-4-yl) amino)phenyl)pentanoic acid;

(R)-3-(4-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-3-((4-ethylphenyl)amino) phenyl)pentanoic acid;

(R)-3-(4-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-3-((6-methoxypyridin-3-yl)amino)phenyl)pentanoic acid;

(R)-3-(4-(ethyl(tetrahydro-2 H-pyran-4-yl)amino)-3-((2-methoxypyrimidin-5-yl) amino)phenyl)pentanoic acid;

(R)-3-(3-((2-(cyclopropylmethoxy) pyrimidin-5-yl)amino)-4-(ethyl(tetrahydro-2H-pyran-4-yl) amino)phenyl) pentanoic acid;

and/or a stereoisomer, a tautomer or a pharmaceutically acceptable salt thereof.

22. The compound of claim 21 that is (S)-3-(3-((4-chlorophenyl) amino)-4-(ethyl(tetrahydro-2H-pyran-4-yl)amino) phenyl)-4-methoxybutanoic acid

and/or a stereoisomer, a tautomer or a pharmaceutically acceptable salt thereof.

23. The compound of claim 21 that is 3-(4-(cyclohexyl(isobutyl) amino)-3-((4-ethylphenyl) amino)phenyl)pentanoic acid

and/or a stereoisomer, a tautomer or a pharmaceutically acceptable salt thereof.

24. The compound of claim 21 that is (R)-3-(3-((2-Ethoxypyrimidin-5-yl)amino)-4-(ethyl(tetrahydro-2H-pyran-4-yl)amino)phenyl)pentanoic acid and/or a stereoisomer, a tautomer or a pharmaceutically acceptable salt thereof.

25. The compound of claim 21 that is 3-(4-(cyclohexyl(isobutyl) amino)-3-((4-fluorophenyl) amino)phenyl)pentanoic acid and/or a stereoisomer, a tautomer or a pharmaceutically acceptable salt thereof.

26. A method of inhibiting activity of indoleamine 2,3-dioxygenase comprising contacting said indoleamine 2,3-dioxygenase with a compound according to claim 1 or a pharmaceutically acceptable salt thereof.

27. A pharmaceutical composition comprising one or more compounds of claim 1 and a pharmaceutical carrier.