Tetrahydro-1H-pyrrolo fused pyridones

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

wherein

one of X, or Y, is NR 8 and the other moiety is —CR 4 R 5 ;

R 12 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;

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 alkylC 3-10 cycloalkyl,

—C 0-10 alkylC 3-10 heterocycloalkyl, 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 8 is selected from —C 1 -C 10 alkyl, —C 2-10 alkenyl, —(C 0-10 alkyl)C 3-10 cycloalkyl, —(C 0-10 alkyl) C 3-10 heterocycloalkyl, —(C 0-10 alkyl)aryl, —(C 0-10 alkyl)heterocyclyl, —(C 0-10 alkyl)C 5-10 cycloalkenyl, C 1-6 alkoxy, aryloxy, heterocyclyloxy, —CO 2 R a , —CONR b R c , —R a C(═N)NR b R c , —S(O) 2 NR b , and —S(O) n R d , wherein said aryl, heterocyclyl, alkoxy, aryloxy, heterocyclyloxy are optionally substituted by one or more substituents R 10 ;

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 0-10 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, oxo, —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 subtstituents R 10 .

2. A compound of claim 1 wherein X is —NR 8 and Y is CR 4 R 5 .

3. A compound of claim 1 wherein Y is —NR 8 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, naphthyl, tetrahydro-naphthyl, indanyl, 2,3-dihydro-1H-indenyl, and biphenyl phenyl.

6. A compound of claim 4 wherein R 8 is selected from —C 1 -C 10 alkyl, —C 2-10 alkenyl, —(C 0-10 alkyl)C 3-10 cycloalkyl, —(C 0-10 alkyl) C 3-10 heterocycloalkyl, —(C 0-10 alkyl)aryl, —(C 0-10 alkyl)heterocyclyl, C 1-6 alkoxy, aryloxy, heterocyclyloxy, —S(O) 2 NR b , and —S(O) n R d , wherein said aryl, heterocyclyl, alkoxy, aryloxy, heterocyclyloxy are optionally substituted by one or more substituents R 10 .

7. A compound of claim 6 , wherein R 8 is selected from —C 1 -C 10 alkyl, —C 2-10 alkenyl, —(C 1-10 alkyl)C 3-10 cycloalkyl, —(C 1-10 alkyl)C 3-10 heterocycloalkyl, —(C 1-10 alkyl)aryl, —(C 1-10 alkyl)heterocyclyl, C 1-6 alkoxy, aryloxy, heterocyclyloxy, —S(O) 2 NR b , and —S(O) n R d , wherein said aryl, heterocyclyl, alkoxy, aryloxy, heterocyclyloxy are optionally substituted by one or more substituents R 10 .

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

9. A compound of claim 8 , wherein in the —C 0-10 alkylheterocyclyl of R 1 , the heterocyclyl moiety is selected from azabenzimidazole, benzoimidazolyl, benzofuryl, benzofurazanyl, benzopyrazolyl, benzothiazolyl, benzothienyl, benzotriazolyl, benzothiophenyl, benzoxazolyl, carbazolyl, carbolinyl, chromanyl, cinnolinyl, furanyl, imidazolyl, indolinyl, indolyl, indolazinyl, indazolyl, isobenzofuryl, isochromanyl, isoindolyl, isoquinolyl, isothiazolyl, isoxazolyl, naphthpyridinyl, oxadiazolyl, oxazolyl, oxazoline, isoxazoline, oxetanyl, pyranyl, pyrazinyl, pyrazolyl, pyridazinyl, pyridopyridinyl, pyridazinyl, pyridinyl, pyrimidyl, pyrrolyl, quinazolinyl, quinolyl, quinoxalinyl, 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, methylenedioxybenzoyl, tetrahydrofuryl, tetrahydrothienyl, tetrahydroquinolinyl, 2,3-dihydrobenzofuryl, 2,3-dihydrobenzo-1,4-dioxinyl, imidazo(2,1-b)(1,3)thiazole, and benzo-1,3-dioxolyl.

10. A compound of claim 9 , wherein in the —C 0-10 alkylheterocyclyl of R 1 , wherein —C 1-3 alkylheterocyclyl is selected from pyrimidinylphenyl, pyridinylphenyl, pyridinyl, thiazolyl, oxadiazolyl, benzothiazolyl, oxazolyl, quinolyl, benzothienyl, pyrazolyl, pyrazinyl, and pyridinyl.

11. A compound selected from:

N-({4-hydroxy-2-oxo-6-pent-4-enoyl-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(biphenyl-4-ylmethyl)-4-hydroxy-2-oxo-6-pent-4-enoyl-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(1,3-benzothiazol-2-ylmethyl)-4-hydroxy-2-oxo-6-pent-4-enoyl-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(3-bromobenzyl)-4-hydroxy-2-oxo-6-pent-4-enoyl-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-bromobenzyl)-4-hydroxy-7-methyl-2-oxo-6-pent-4-enoyl-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(4-bromobenzyl)-4-hydroxy-5-methyl-2-oxo-6-pent-4-enoyl-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-6-ium-3-yl}carbonyl)glycine trifluoroacetate;

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

N-({6-acetyl-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pridin-3-yl}carbonyl)glycine;

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

N-({4-hydroxy-6-(morpholin-4-ylcarbonyl)-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({6-[(dimethylamino)sulfonyl]-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

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

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

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

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

N-({4-hydroxy-2-oxo-6-(pyrrolidin-1-ylcarbonyl)-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

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

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

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

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

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

N-({6-[(1,3-dimethyl-1H-pyrazol-5-yl)carbonyl]-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-6-(pyrazolo[1,5-a]primidin-2-ylcarbonyl)-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

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

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

N-({4-hydroxy-6-(1-methyl-L-prolyl)-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-6-(5-oxo-L-prolyl)-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-6-(1,3-thiazol-5-ylcarbonyl)-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({6-[(1,5-dimethyl-1H-pyrazol-2-ium-3-yl)carbonyl]-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine chloride;

N-({4-hydroxy-6-{[(2S)-1-methylpyrrolidinium-2-yl]carbonyl}-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine trifluoroacetate;

N-({4-hydroxy-6-(isoxazol-5-ylcarbonyl)-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-6-(1,3-thiazol-2-ylcarbonyl)-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-2-oxo-6-(1,2,3-thiadiazol-4-ylcarbonyl)-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-({4-hydroxy-6-[(6-methylpyridinium-3-yl)carbonyl]-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine trifluoroacetate;

N-({4-hydroxy-6-(1,3-oxazol-4-ylcarbonyl)-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine;

N-{[1-(biphenyl-4-ylmethyl)-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-({6-(4-chlorobenzyl)-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-6-ium-3-yl}carbonyl)glycine trifluoroacetate;

N-({6-(3-chlorobenzyl)-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-6-ium-3-yl}carbonyl)glycine chloride;

N-({6-ethyl-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-6-ium-3-yl}carbonyl)glycine trifluoroacetate;

N-({6-(3-cyanopyridinium-2-yl)-4-hydroxy-2-oxo-1-[4-(trifluoromethyl)benzyl]-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl}carbonyl)glycine trifluoroacetate;

N-{[1-(biphenyl-3-ylmethyl)-4-hydroxy-2-oxo-6-pent-4-enoyl-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(biphenyl-3-ylmethyl)-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-[(4′-chlorobiphenyl-3-yl)methyl]-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pridin-3-yl]carbonyl}glycine;

N-{[4-hydroxy-2-oxo-1-(3-pyrimidin-5-ylbenzyl)-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-[(2′-chlorobiphenyl-3-yl)methyl]-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(biphenyl-4-ylmethyl)-4-hydroxy-7-methyl-2-oxo-6-pent-4-enoyl-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(biphenyl-2-ylmethyl)-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-[(3′-chlorobiphenyl-3-yl)methyl]-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[4-hydroxy-2-oxo-1-(3-pyridin-4-ylbenzyl)-6-(1,3-thiazol-3-ium-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine trifluoroacetate;

N-{[4-hydroxy-2-oxo-1-(3-pyridin-3-ylbenzyl)-6-(1,3-thiazol-3-ium-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pridin-3-yl]carbonyl}glycine trifluoroacetate;

N-{[1-[3-(6-fluoropyridin-3-yl)benzyl]-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(benzyl-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(biphenyl-4-ylmethyl)-4-hydroxy-7-methyl-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine;

N-{[1-(2-cyanobenzyl)-4-hydroxy-2-oxo-6-(1,3-thiazol-4-ylcarbonyl)-2,5,6,7-tetrahydro-1H-pyrrolo[3,4-b]pyridin-3-yl]carbonyl}glycine; and

pharmaceutically acceptable salts and solvates 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 or solvate 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 or solvate thereof.