Tetrahydrothieno pyridines

1. A compound of formula I and pharmaceutically acceptable salts thereof

wherein

R 8 is selected from hydrogen, C 1-6 alkyl, optionally substituted with a hydroxy, —SH, —NH 2 or —CO 2 H, and C 3-6 cycloalkyl optionally substituted with a hydroxy, —SH, —NH 2 or —CO 2 H;

n is 1 or 2;

one of X or Y is —S(O) n , and the other is CR 4 R 5 ;

R 1 is selected from

—C 1-10 alkyl,

—C 2-10 alkenyl,

—C 5-10 cycloalkenyl,

—C 2-10 alkynyl,

—C 0-10 alkylaryl,

—C 0-10 alkylheterocyclyl;

—C 0-10 alkyl-C 0-10 cycloalkyl, and

perfluoroC 1-6 alkyl;

wherein in R 1 said alkyl, alkenyl, alkynyl, cycloalkenyl, aryl, heterocycloalkyl, heterocyclyl, and cycloalkyl are each optionally substituted with one or more R 9 substituents;

R 2 and R 3 are independently selected from hydrogen, phenyl, heterocyclyl, and —C 1-10 alkyl, wherein C 1-10 alkyl is unsubstituted or substituted with one or more fluorine atoms, and phenyl is unsubstituted or substituted with or more substituents selected from fluoro, chloro, hydroxyl,

C 1-10 alkyl, and —OC 1-10 alkyl;

R 4 , R 5 , R 6 , and R 7 are independently selected from hydrogen, cyano, oxo, —C 1 -C 10 alkyl, —C 2-10 alkenyl, —C 3-10 cycloalkyl, —(C 1-10 alkyl)aryl, (C 0-10 alkyl)heterocyclyl, —C 5-10 cycloalkenyl, —C 2-10 alkynyl, —SO n (C 1-10 alkyl) and —SO n aryl wherein said alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, and heterocyclyl are optionally substituted by one or more substituents R 9 , and

optionally one set of substituents, R 4 and R 5 , or R 6 and R 7 , are linked together to form a ring of 5 to 8 atoms optionally substituted with one or more substituents R 9 ; where said ring is partially or fully unsaturated having 0, 1 or 2 heteroatoms independently selected from —NR 6 —, —O— and —S(O) n —;

R 9 is selected from halogen, hydroxy, oxo, cyano, aryl, heterocyclyl, —C 1-6 alkyl, —C 1-6 alkoxy, aryloxy, heterocyclyloxy, —CO 2 R a , —NR b R c , —CONR b R c , —OCO 2 R a , —OCONR b R c , —NR d CO 2 R a , —NR d CONR b R c , —SC 0-6 alkyl and —S(O) n R d , wherein said aryl, heterocyclyl, alkoxy, aryloxy, heterocyclyloxy are optionally substituted by one or more substituents R 10 ;

R 10 is selected from hydroxy, aryl, heterocyclyl, halogen, —C 1-6 alkyl, C 1-6 alkoxy, halogen, CO 2 H, cyano, O(C═O) 0-1 C 1-6 alkyl, NO 2 , trifluoromethoxy, trifluoroethoxy, —O (0-1) (C 1-10 )perfluoroalkyl, C 0-10 alkylaminocarbonylamino, C 0-10 alkyloxycarbonylaminoC 0-10 alkyl, C 0-10 alkylcarbonylaminoC 0-10 alkyl, C 0-10 alkylaminosulfonylaminoC 0-10 alkyl, C 0-10 alkylsulfonylaminoC 0-10 alkyl, C 0-10 alkylsulfonyl, C 0-10 alkylaminosulfonyl, C 0-10 alkylaminocarbonyl, —(C═O)N(C 0-6 alkyl) 2 , —S(C 0-6 alkyl), and NH 2 ;

R a is chosen from hydrogen; —C 1-10 alkyl, —(C 1-6 alkyl)C 3-8 cycloalkyl; and

—(C 1-6 alkyl)phenyl; and

R b , R c , and R d are each independently chosen from hydrogen, —C 1-10 alkyl, —C 3-10 cycloalkyl, aryl, and heterocyclyl, wherein said alkyl, cycloalkyl, aryl and heterocyclyl are optionally substituted by one or more substituents R 10 .

2. A compound of claim 1 wherein X is —S(O) n , and Y is CR 4 R 5 .

3. A compound of claim 1 wherein Y is —S(O) n , and X is CR 4 R 5 .

4. A compound of claim 1 wherein R 1 is selected from —C 0-10 alkylaryl, and —C 0-10 alkylheterocyclyl.

5. A compound of claim 4 , wherein C 0-10 alkylaryl is —C 1-3 alkylaryl and the aryl moiety is selected from phenyl, napthyl, tetrahydronaphthyl, indanyl, biphenyl and 2,3-dihydroindenyl.

6. A compound of claim 5 wherein —C 1-3 alkylaryl is selected from wherein —C 1-3 alkylphenyl, —C 1-3 alkybiphenyl and —C 1-3 alkybiphenyl 2,3-dihydroindenyl.

7. A compound of claim 4 wherein R 1 is —C 0-10 alkylheterocyclyl.

8. A compound of claim 7 , wherein in —C 0-10 alkylheterocyclyl, the heterocyclyl moiety is selected from azabenzimidazolyl, benzoimidazolyl, benzofuryl, benzofurazanyl, benzopyrazolyl, benzotriazolyl, benzothiophenyl, benzothiazolyl, benzothienyl, benzoxazolyl, carbazolyl, carbolinyl, chromanyl, cinnolinyl, furanyl, imidazolyl, indolinyl, indolyl, indolazinyl, indazolyl, isobenzofuryl, isochromanyl, isoindolyl, isoquinolyl, isothiazolyl, isoxazolyl, naphthpyridinyl, oxadiazolyl, oxazolyl, oxazolinyl, isoxazolinyl, oxetanyl, pyranyl, pyrazinyl, pyrazolyl, pyridazinyl, pyridopyridinyl, pyridazinyl, pyridinyl, pyrimidyl, pyrrolyl, quinazolinyl, quinolyl, quinoxalinyl, tetrahydropyranyl, tetrazolyl, tetrazolopyridyl, thiadiazolyl, thiazolyl, thienyl, triazolyl, azetidinyl, aziridinyl, 1,4-dioxanyl, hexahydroazepinyl, piperazinyl, piperidinyl, pyrrolidinyl, morpholinyl, thiomorpholinyl, dihydrobenzoimidazolyl, dihydrobenzofuryl, dihydrobenzothiophenyl, dihydrobenzoxazolyl, dihydrofuryl, dihydroimidazolyl, dihydroindolyl, dihydroisooxazolyl, dihydroisothiazolyl, dihydrooxadiazolyl, dihydrooxazolyl, dihydropyrazinyl, dihydropyrazolyl, dihydropyridinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, dihydropyrimidinyl, dihydropyrrolyl, dihydroquinolinyl, dihydrotetrazolyl, dihydrothiadiazolyl, dihydrothiazolyl, dihydrothienyl, dihydrotriazolyl, dihydroazetidinyl, methylenedioxybenzyl, tetrahydrofuryl, tetrahydrothienyl, tetrahydroquinolinyl, 2,3-dihydrobenzofuryl, 2,3-dihydrobenzo-1,4-dioxinyl, imidazo(2,1-b)(1,3)thiazole, pyrimidinylphenyl, pyridinylphenyl, and benzo-1,3-dioxolyl.

9. A compound of claim 8 wherein in —C 0-10 alkylheterocyclyl, the heterocyclyl moiety is selected from pyridinyl, phenyl, thiazolyl, oxadiazolyl, benzothiazolyl, oxazolyl, quinolyl, benzothienyl, pyrazolyl, pyrazinyl, and pyridinyl.

10. A compound of claim 8 wherein —C 0-10 alkylheterocyclyl is —C 1-3 alkylheterocyclyl.

11. A compound according to claim 1 selected from:

N-({1-[(6-chloropyridin-3-yl)methyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(4-bromobenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-cyanobenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-[(4-hydroxy-2-oxo-1-{[6-(trifluoromethyl)pyridin-3-yl]methyl}-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine;

N-({4-hydroxy-1-[4-(methylsulfonyl)benzyl]-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-1-[(4-phenyl-1,3-thiazol-2-yl)methyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine

N-{[4-hydroxy-1-(4-isopropylbenzyl)-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-tert-butylbenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-2-oxo-1-[(5-phenyl-1,2,4-oxadiazol-3-yl)methyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(1,3-benzothiazol-2-ylmethyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-bromophenyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({1-[3-fluoro-5-(trifluoromethyl)benzyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(3-chlorobenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-chloro-2-methylbenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-chlorobenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-ethylbenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({1-[4-chloro-3-(trifluoromethyl)benzyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(3,4-dichlorobenzyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-2-oxo-1-[4-(trifluoromethoxy)benzyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-1-[(2-phenyl-1,3-oxazol-4-yl)methyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(1-benzothien-2-ylmethyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-2-oxo-1-[4-(1H-pyrazol-1-yl)benzyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-1-[(1-phenyl-1H-pyrazol-4-yl)methyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-1-[(4′-methylbiphenyl-4-yl)methyl]-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-[(1-{[5-(2-fluorophenyl)pyrazin-2-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine;

N-({4-hydroxy-2-oxo-1-[4-(1H-pyrazol-5-yl)benzyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({1-[(4′-acetylbiphenyl-4-yl)methyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(biphenyl-4-ylmethyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({1-[(4′-chlorobiphenyl-4-yl)methyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({1-[4-(3,5-dimethyl-1H-pyrazol-4-yl)benzyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({1-[4-(4-fluorophenoxy)benzyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({1-[4-(4-chlorophenoxy)benzyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({1-[(4′-ethoxybiphenyl-4-yl)methyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-1-[4-(2-thienyl)benzyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-[(4-hydroxy-2-oxo-1-{[4′-(trifluoromethoxy)biphenyl-4-yl]methyl}-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine;

N-{[1-({2′-[(diethylamino)carbonyl]biphenyl-4-yl}methyl)-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-2-oxo-1-[4′-(trifluoromethoxy)biphenyl-4-yl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-[(1-{[6-(3-chlorophenyl)pyridinium-3-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine trifluoroacetate;

N-[(1-{[6-(4-fluorophenyl)pyridinium-3-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine trifluoroacetate;

N-[(1-{[6-(2-chlorophenyl)pyridinium-3-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine trifluoroacetate;

N-({4-hydroxy-2-oxo-1-[3′-(trifluoromethoxy)biphenyl-4-yl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-[(1-{[6-(2-fluorophenyl)pyridin-3-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine;

N-{[4-hydroxy-2-oxo-1-({6-[4-(trifluoromethyl)phenyl]pyridinium-3-yl}methyl)-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine trifluoroacetate;

N-{[4-hydroxy-2-oxo-1-({6-[2-(trifluoromethyl)phenyl]pyridinium-3-yl}methyl)-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine trifluoroacetate;

N-({1-[(3′-cyanobiphenyl-4-yl)methyl]-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[4-hydroxy-1-({6-[2-(methylthio)phenyl]pyridinium-3-yl}methyl)-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine trifluoroacetate;

N-[(4-hydroxy-1-{[6-(2-methylphenyl)pyridinium-3-yl]methyl}-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine trifluoroacetate;

N-{[4-hydroxy-2-oxo-1-({6-[3-(trifluoromethoxy)phenyl]pyridinium-3-yl}methyl)-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine trifluoroacetate;

N-[(1-{[6-(2-ethylphenyl)pyridinium-3-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine trifluoroacetate;

N-[(1-{[6-(2,5-difluorophenyl)pyridinium-3-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine trifluoroacetate;

N-{[4-hydroxy-2-oxo-1-(4-quinolinium-5-ylbenzyl)-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine chloride;

N-[(1-{[5-(2-chlorophenyl)pyrazin-2-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine;

N-[(4-hydroxy-1-{[5-(2-methylphenyl)pyrazin-2-yl]methyl}-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine;

N-{[4-hydroxy-1-({5-[2-(methylthio)phenyl]pyrazin-2-yl}methyl)-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-[(1-{[5-(2,5-difluorophenyl)pyrazin-2-yl]methyl}-4-hydroxy-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl)carbonyl]glycine;

N-{[4-hydroxy-2-oxo-1-({5-[2-(trifluoromethyl)phenyl]pyrazin-2-yl}methyl)-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-1-[(4′-methylbiphenyl-4-yl)methyl]-6,6-dioxido-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-1-[(4′-methylbiphenyl-4-yl)methyl]-6-oxido-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(4-chlorobenzyl)-4-hydroxy-6,6-dioxido-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[4-hydroxy-1-(4-isopropylbenzyl)-6,6-dioxido-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-6,6-dioxido-2-oxo-1-[(4-phenyl-1,3-thiazol-2-yl)methyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-6,6-dioxido-2-oxo-1-[4-(trifluoromethyl)benzyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(biphenyl-4-ylmethyl)-4-hydroxy-6,6-dioxido-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-6,6-dioxido-2-oxo-1-[4-(trifluoromethoxy)benzyl]-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(4-ethylbenzyl)-4-hydroxy-6,6-dioxido-2-oxo-1,2,5,7-tetrahydrothieno[3,4-b]pyridin-3-yl]carbonyl}glycine; and

pharmaceutically acceptable salts thereof.

12. A pharmaceutical composition comprising a compound of claim 1 and pharmaceutically acceptable carrier.

13. A method of enhancing endogenous production of erythropoietin in a mammal which comprises administering to the mammal an amount of a compound of claim 1 , or a pharmaceutically acceptable salt thereof, that is effective for enhancing endogenous production of erythropoietin.

14. A method for the treatment of anemia in a mammal which comprises administering to the mammal an effective amount of a compound of claim 1 , or a pharmaceutically acceptable salt thereof.