Tetrahydropyridine derivatives and their use as antibacterial agents

1. A tetrahydropyridine compound represented by the following formula I, a stereoisomer thereof or a pharmaceutically acceptable salt thereof:

wherein,

n is 1, 2 or 3;

R 1 is C1-C6 alkyl or C1-C6 haloalkyl;

R 2 is hydrogen or C1-C6 alkyl;

R 3 is hydrogen, C1-C6 alkyl, C1-C6 alkoxy, —OH or halogen;

L is C3-C7 cycloalkyl, aryl, heteroaryl or null, wherein at least one H of C3-C7 cycloalkyl, aryl or heteroaryl may be substituted with halogen, C1-C6 alkyl, C1-C6 haloalkyl, —NR A R B or —OH;

D is C≡C, C3-C7 cycloalkyl, aryl, heteroaryl or null, wherein at least one H of C3-C7 cycloalkyl, aryl or heteroaryl may be substituted with halogen, C1-C6 alkyl, C1-C6 haloalkyl, —NR A R B or —OH;

E is C≡C, C3-C7 cycloalkyl, aryl, heteroaryl or null, wherein at least one H of C3-C7 cycloalkyl, aryl or heteroaryl may be substituted with halogen, C1-C6 alkyl, C1-C6 haloalkyl, —NR A R B or —OH;

G is C1-C6 alkyl, C3-C7 cycloalkyl, 4-6 membered heterocycloalkyl, aryl or heteroaryl,

wherein at least one H of C1-C6 alkyl may be substituted with halogen, —NR A R B , —OH or —OR C ,

at least one H of C3-C7 cycloalkyl or 4-6 membered heterocycloalkyl may be substituted with C1-C6 alkyl, C1-C6 alkyl-NR A R B , C1-C6 hydroxyalkyl, C1-C6 haloalkyl, C1-C6 alkoxy, C1-C6 alkyl-OR C , —NR A R B , —OH, —(C═O)—C1-C6 alkyl or —S(═) 2 —C1-C6 alkyl,

at least one H of aryl or heteroaryl may be substituted with C1-C6 alkyl, C1-C6 hydroxyalkyl, C1-C6 alkyl-NR A R B , halogen, nitro, cyano, —NR A R B , —OH, —OR C , —S(═O) 2 —C1-C6 alkyl, —S(═O) 2 —NR A R B or —N—S(═O) 2 —C1-C6 alkyl;

R A and R B are each independently hydrogen or C1-C6 alkyl, or R A and R B may be linked together to form 4-6 membered ring, wherein the 4-6 membered ring may have O or S atom and at least one H of the 4-6 membered ring may be substituted with halogen, —OH or C1-C6 hydroxyalkyl;

R C is C1-C6 alkyl, C1-C6 hydroxyalkyl, —(C═O)—NR D R E or —S(═O) 2 —C1-C6 alkyl; and

R D and R E are each independently hydrogen or C1-C6 alkyl.

2. The tetrahydropyridine compound, a stereoisomer thereof or a pharmaceutically acceptable salt thereof according to claim 1 :

wherein,

n is 1 or 2;

R 1 is C1-C6 alkyl;

R 2 is C1-C6 alkyl;

R 3 is hydrogen;

L is aryl, heteroaryl or null, wherein at least one H of aryl or heteroaryl may be substituted with halogen, C1-C6 alkyl or C1-C6 haloalkyl;

D is C≡C or null;

E is C≡C or null;

G is C1-C6 alkyl, C3-C7 cycloalkyl, 4-6 membered heterocycloalkyl, aryl or heteroaryl,

wherein at least one H of C1-C6 alkyl may be substituted with halogen, —NR A R B , —OH or —OR C ,

at least one H of 4-6 membered heterocycloalkyl may be substituted with C1-C6 alkyl, —(C═O)—C1-C6 alkyl or —S(═O) 2 —C1-C6 alkyl,

at least one H of aryl or heteroaryl may be substituted with C1-C6 alkyl, C1-C6 hydroxyalkyl, C1-C6 alkyl-NR A R B , halogen, nitro, cyano, —NR A R B , —OH, —OR C , —S(═O) 2 —C1-C6 alkyl or —S(═O) 2 —NR A R B ;

R A and R B are each independently hydrogen or C1-C6 alkyl, or R A and R B may be linked together to form 4-6 membered ring, wherein the 4-6 membered ring may have O atom and at least one H of the 4-6 membered ring may be substituted with C1-C6 hydroxyalkyl;

R C is C1-C6 alkyl, C1-C6 hydroxyalkyl, —(C═O)—NR D R E or —S(═O) 2 —C1-C6 alkyl; and

R D and R E are each independently hydrogen.

3. The tetrahydropyridine compound, a stereoisomer thereof or a pharmaceutically acceptable salt thereof according to claim 2 :

wherein,

n is 1 or 2;

R 1 is C1-C6 alkyl;

R 2 is C1-C6 alkyl;

R 3 is hydrogen;

L is phenyl, pyridinyl or null, wherein at least one H of phenyl or pyridinyl may be substituted with halogen, C1-C6 alkyl or C1-C6 haloalkyl;

D is C≡C or null;

E is C≡C or null;

G is C1-C6 alkyl, C3-C6 cycloalkyl, 4-6 membered heterocycloalkyl, phenyl, pyridinyl, furanyl, thiophenyl or imidazolyl,

wherein at least one H of C1-C6 alkyl may be substituted with halogen, —NR A R B , —OH or —OR C ,

at least one H of 4-6 membered heterocycloalkyl may be substituted with C1-C6 alkyl, —(C═O)—C1-C6 alkyl or —S(═O) 2 —C1-C6 alkyl,

at least one H of phenyl, pyridinyl, furanyl, thiophenyl or imidazolyl may be substituted with C1-C6 alkyl, C1-C6 hydroxyalkyl, C1-C6 alkyl-NR A R B , halogen, nitro, cyano, —NR A R B , —OH, —OR C , —S(═O) 2 —C1-C6 alkyl or —S(═O) 2 —NR A R B ;

R A and R B are each independently hydrogen or C1-C6 alkyl, or R A and R B may be linked together to form 4-6 membered ring, wherein the 4-6 membered ring may have O atom and at least one H of the 4-6 membered ring may be substituted with C1-C6 hydroxyalkyl;

R C is C1-C6 alkyl, C1-C6 hydroxyalkyl, —(C═O)—NR D R E or —S(═O) 2 —C1-C6 alkyl; and

R D and R E are each independently hydrogen.

4. The tetrahydropyridine compound, a stereoisomer thereof or a pharmaceutically acceptable salt thereof according to claim 3 , wherein the compound is selected from the group consisting of compounds described in the following table:

1) 4-(4-(4-((4-(dimethylamino)phenyl) ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

2) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(phenylethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

3) N-hydroxy-4-(4-(4-((4-methoxyphenyl)ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

4) 4-(4-(4-(cyclopropylethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

5) N-hydroxy-4-(4-(4-(4-hydroxybut-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

6) 4-(4-(4-(hex-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

7) 4-(4-(4-(3-(dimethylamino)prop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

8) N-hydroxy-4-(4-(4-(3-hydroxybut-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

9) 4-(4-(4-(cyclopentylethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

10) 4-(4-(4-(cyclohexylethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

11) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(pent-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

12) 4-(4-(4-(3-cyclohexylprop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl) butanamide;

13) N-hydroxy-2-methyl-4-(4-(4-(4-methylpent-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-(methylsulfonyl) butanamide;

14) 4-(4-(4-(5-chloropent-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl) butanamide;

15) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(3-(pyrrolidin-1-yl)prop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

16) 4-(4-(4-(3-(diethylamino)prop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl) butanamide;

17) N-hydroxy-4-(4-(4-(3-((S)-2-(hydroxymethyl)pyrrolidin-1-yl)prop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl) butanamide;

18) N-hydroxy-4-(4-(4-(5-hydroxypent-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

19) 5-(4-(1-(4-(hydroxyamino)-3-methyl-3-(methylsulfonyl)-4-oxobutyl)-1,2,3,6-tetrahydropyridin-4-yl)phenyl)pent-4-yn-1-yl methanesulfonate;

20) 4-(4-(4-(5-(dimethylamino)pent-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

21) 4-(4-(4-(5-aminopent-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

22) N-hydroxy-4-(4-(4-(3-hydroxyprop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

23) N-hydroxy-4-(4-(4-(3-methoxyprop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

24) N-hydroxy-4-(4-(4-(3-(3-hydroxypropoxy)prop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

25) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(3-morpholinoprop-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

26) 3-(4-(1-(4-(hydroxyamino)-3-methyl-3-(methylsulfonyl)-4-oxobutyl)-1,2,3,6-tetrahydropyridin-4-yl)phenyl)prop-2-yn-1-yl carbamate;

27) 5-(4-(1-(4-(hydroxyamino)-3-methyl-3-(methylsulfonyl)-4-oxobutyl)-1,2,3,6-tetrahydropyridin-4-yl)phenyl) pent-4-yn-1-yl carbamate;

28) N-hydroxy-4-(4-(4-(5-methoxypent-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

29) N-hydroxy-4-(4-(4-(6-hydroxyhex-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

30) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(6-morpholinohex-1-yn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

31) 4-(4-(4-(3-(dimethylamino)prop-1-yn-1-yl)-3-fluorophenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl) butanamide;

32) 4-(4-(4-(3-(dimethylamino)prop-1-yn-1-yl)-3,5-difluorophenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

33) 4-(4-(4-(3-(dimethylamino)prop-1-yn-1-yl)-2-fluorophenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

34) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(thiophen-2-ylethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

35) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-((4-nitrophenyl)ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

36) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(pyridin-3-ylethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

37) N-hydroxy-4-(4-(4-((4-hydroxyphenyl)ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

38) N-hydroxy-2-methyl-4-(4-(4-((1-methyl-1H-imidazol-4-yl)ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-(methylsulfonyl)butanamide;

39) N-hydroxy-2-methyl-4-(4-(4-((1-methylazetidin-3-yl) ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-(methylsulfonyl)butanamide;

40) 4-(4-(4-((1-acetylazetidin-3-yl)ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

41) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-((1-(methylsulfonyl)azetidin-3-yl)ethynyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

42) 4-(4-(3-fluoro-4-(7-hydroxyhepta-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

43) 4-(4-(3-fluoro-4-(6-hydroxyhexa-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

44) 4-(4-(4-(cyclopropylbuta-1,3-diyn-1-yl)-3-fluorophenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

45) 4-(4-(4-(5-(dimethylamino)penta-1,3-diyn-1-yl)-3-fluorophenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl) butanamide;

46) N-hydroxy-4-(4-(4-(7-hydroxyhepta-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

47) N-hydroxy-4-(4-(4-(6-hydroxyhexa-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

48) N-hydroxy-4-(4-(4-(5-hydroxypenta-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

49) 4-(4-(4-(5-(dimethylamino)penta-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

50) N-hydroxy-4-(4-(4-(5-methoxypenta-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

51) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(phenylbuta-1,3-diyn-1-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

52) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(pyridin-4-ylethynyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

53) 4-(4-((4-bromophenyl)ethynyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

54) N-hydroxy-4-(4-(7-hydroxyhepta-1,3-diyn-1-yl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

55) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(pyridin-4-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

56) 4-(4-([1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

57) 4-(4-(4′-chloro-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

58) 4-(4-(4′-fluoro-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

59) N-hydroxy-4-(4-(4′-hydroxy-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

60) 4-(4-(3′-fluoro-4′-methoxy-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

61) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(pyridin-3-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

62) 4-(4-(4-(6-fluoropyridin-3-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

63) 4-(4-(4-(furan-3-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

64) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4′-(methylsulfonyl)-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

65) N-hydroxy-4-(4-(4′-(hydroxymethyl)-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

66) 4-(4-(4′-cyano-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

67) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4′-pentyl-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

68) 4-(4-(4′-(azetidin-1-ylsulfonyl)-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

69) 4′-(1-(4-(hydroxyamino)-3-methyl-3-(methylsulfonyl)-4-oxobutyl)-1,2,3,6-tetrahydropyridin-4-yl)-[1,1′-biphenyl]-4-yl methanesulfonate;

70) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(thiophen-3-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

71) N-hydroxy-4-(4-(4-(3-methoxythiophen-2-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

72) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4-(4-methylthiophen-2-yl)phenyl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

73) 4-(4-(4′-(ethylsulfonyl)-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide;

74) N-hydroxy-2-methyl-2-(methylsulfonyl)-4-(4-(4′-(morpholinomethyl)-[1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)butanamide;

75) N-hydroxy-4-(6-(3-methoxyprop-1-yn-1-yl)-3′,6′-dihydro-[3,4′-bipyridin]-1′ (2′H)-yl)-2-methyl-2-(methylsulfonyl)butanamide;

76) 3-(4-([1,1′-biphenyl]-4-yl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)propanamide;

77) 4-(4-(4-(3-(dimethylamino)prop-1-yn-1-yl)-3-methylphenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide; and

78) 4-(4-(4-(3-(dimethylamino)prop-1-yn-1-yl)-3-(trifluoromethyl)phenyl)-3,6-dihydropyridin-1(2H)-yl)-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide.

5. A method for inhibiting UDP-3-O—(R-3-hydroxymyristoyl)-N-acetylglucosamine deacetylase (LpxC), comprising administering to a patient in need thereof a therapeutically effective amount of the compound represented by formula I, stereoisomer thereof or pharmaceutically acceptable salt thereof according to claim 1 .

6. A method for treating bacterial infections, comprising administering to a patient in need thereof a therapeutically effective amount of the compound represented by formula I, stereoisomer thereof or pharmaceutically acceptable salt thereof according to claim 1 .

7. The method of claim 6 , wherein the bacterial infections are caused by Gram-negative bacteria.

8. The method of claim 7 , wherein the bacterial infections are selected from the group consisting of nosocomial pneumonia, urinary tract infections, systemic infections, skin and soft tissue infections, surgical infections, intraabdominal infections, lung infections, endocarditis, diabetic foot infection, osteomyelitis, and central nervous system infections.