Penam derivatives for treating bacterial infections

1. A compound having a formula of:

or a stereoisomer, pharmaceutically acceptable salt, solvate, prodrug, or deuterium-exchanged compound thereof,

wherein R 1 is hydrogen, a pharmaceutically acceptable salt forming agent, or an ester residue;

Y is independently selected from —S—, —SO—, and —SO 2 —;

L is one or a combination of groups selected from:

(C 1 -C 8 )alkylene, (C 3 -C 8 )cycloalkylene containing one to three heteroatoms, arylene, heteroarylene, (C 3 -C 8 )heterocycloalkylene, —C(═O)—, —O—, —S(O) n —, wherein n is 0, 1, or 2, —N(R 2 )—, —C(R 3 )═C(R 4 )—, and —C═N—,

wherein R 2 , R 3 and R 4 are selected from hydrogen, (C 1 -C 8 )alkyl, (C 3 -C 8 )cycloalkyl, (C 1 -C 8 )alkyloxyl, aryl, heteroaryl, and (C 3 -C 8 )heterocycloalkyl, or R 3 and R 4 join together to form a bond; and

Z is an iron chelating moiety selected from

wherein R 5 , R 6 and R 7 are independently hydrogen, hydroxyl, halogen, nitrile, nitro, amino, CF 3 , OCF 3 , alkyl, alkylamino, alkoxy, aryl, or heteroaryl, or wherein two of R 5 , R 6 and R 7 join together to form a 5-8 membered ring.

2. The compound of claim 1 , wherein L comprises carbon or nitrogen atoms further substituted by one to three substituents.

3. The compound of claim 1 , wherein the 5-8 membered ring formed by two of R 5 , R 6 and R 7 is further substituted.

4. The compound of claim 1 , wherein Y is —SO 2 —.

5. The compound of claim 1 , wherein L is selected from

wherein X is one or a combination of two to five groups selected from (C 1 -C 8 )alkylene, (C 3 -C 8 )cycloalkylene, (C 3 -C 8 )heterocycloalkylene, arylene, heteroarylene, —O—, —N(R 2 )—, and —C(O)—, and wherein R 2 is hydrogen, (C 1 -C 8 )alkyl, (C 3 -C 8 )cycloalkyl, (C 1 -C 8 )alkyloxyl, aryl, heteroaryl, or (C 3 -C 8 )heterocycloalkyl.

6. The compound of claim 1 , wherein L is (C 3 -C 8 )heterocycloalkylene and wherein the (C 3 -C 8 )heterocycloalkylene is unsaturated.

7. The compound of claim 1 , wherein Z is selected from:

8. A pharmaceutical composition comprising a pharmaceutically effective amount of a compound of claim 1 in combination with a pharmaceutically acceptable carrier.

9. The pharmaceutical composition of claim 8 , further comprising one or more additional antibacterial agents.

10. A method of treating or preventing a microbial infection in a subject in need of such treatment by administering the pharmaceutical composition of claim 8 .

11. A compound selected from:

(2S,3R,5R)-3-((E)-(2-(2-chloro-4,5-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-methyl-7-oxo-3-((E)-(2-(2,3,4-trihydroxybenzoyl)hydrazono)methyl)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-chloro-3,4-dihydroxybenzoyl)-2-methylhydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2,5-dichloro-3,4-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3,4-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-methyl-7-oxo-3-((E)-(2-(3,4,5-trihydroxybenzoyl)hydrazono)methyl)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3,4-dihydroxybenzoyl)-2-methylhydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-bromo-3,4-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-methyl-7-oxo-3-((E)-(2-(2,3,6-trichloro-4,5-dihydroxybenzoyl)hydrazono)methyl)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2,6-dichloro-3,4-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-fluoro-3,4-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3,4-dihydroxy-2-methylbenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(3,4-dihydroxyphenyl)acetyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-((R)-2-((tert-butoxycarbonyl)amino)-3-(3,4-dihydroxyphenyl)propanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3-chloro-4,5-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-chloro-3,4-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3-(3,4-dihydroxyphenyl)propanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2,5-dihydroxy-3,6-dimethylbenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2,3-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(1-(2-chloro-3,4-dihydroxybenzoyl)pyrrolidine-3-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(1-(2-chloro-3,4-dihydroxybenzoyl)azetidine-3-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(1-(2-chloro-3,4-dihydroxybenzoyl)pyrrolidine-2-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(5-(3,4-dihydroxybenzamido)picolinoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(1-(2-chloro-3,4-dihydroxybenzoyl)piperidine-4-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(2-chloro-3,4-dihydroxybenzamido)-3-hydroxypropanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(2-chloro-3,4-dihydroxybenzamido)-3-phenylpropanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(4-((2-chloro-3,4-dihydroxybenzamido)methyl)benzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(4-((3,4-dihydroxybenzamido)methyl)benzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

((2S,3R,5R)-3-((E)-(2-(2-(3,4-dihydroxybenzamido)-3-methylbutanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(2-chloro-3,4-dihydroxybenzamido)-3-methylbutanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(1-(2-chloro-3,4-dihydroxybenzoyl)piperidine-3-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(3,4-dihydroxybenzamido)-3-hydroxypropanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(3,4-dihydroxybenzamido)-3-phenylpropanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(1-(3,4-dihydroxybenzamido)cyclopropanecarbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(1-(2-chloro-3,4-dihydroxybenzamido)cyclopropanecarbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(4-((3,4-dihydroxybenzoyl)oxy)benzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-((tert-butoxycarbonyl)amino)-3-((2-chloro-3,4-dihydroxybenzoyl)oxy)propanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3′,4′-dihydroxy-[1,1′-biphenyl]-4-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(4-((2-chloro-3,4-dihydroxybenzoyl)oxy)benzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(5-(2-chloro-3,4-dihydroxybenzamido)picolinoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(2-chloro-3,4-dihydroxybenzamido)acetyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3-(2-chloro-3,4-dihydroxybenzamido)propanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(6-(2-chloro-3,4-dihydroxybenzamido)hexanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-((S)-2-(2-chloro-3,4-dihydroxybenzamido)propanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(4-(2-chloro-3,4-dihydroxybenzamido)butanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-(3,4-dihydroxybenzamido)acetyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-((S)-2-(3,4-dihydroxybenzamido)propanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(4-(3,4-dihydroxybenzamido)butanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3-(3,4-dihydroxybenzamido)propanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(6-(3,4-dihydroxybenzamido)hexanoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3,4-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-chloro-3,4-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-(3,4-dihydroxyphenyl)-2-oxoethyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2,3-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-methyl-7-oxo-3-(((2-(3,4,5-trihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3,4-dihydroxybenzoyl)-1-methylhydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-chloro-4,5-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-chloro-3,4-dihydroxybenzoyl)-1-methylhydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3,4-dihydroxybenzoyl)-2-methylhydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-methyl-7-oxo-3-(((2-(2,3,4-trihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2,6-dichloro-3,4-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2,5-dichloro-3,4-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-fluoro-3,4-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3-(3,4-dihydroxyphenyl)-3-oxopropyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-chloro-4,5-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((((E)-2-(3,4-dihydroxybenzylidene)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3-chloro-4,5-dihydroxybenzoyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-(3,4-dihydroxybenzamido)acetyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((3-(3,4-dihydroxybenzamido)pyrrolidine-1-carbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((4-(3,4-dihydroxybenzoyl)piperazine-1-carbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(2-(2-chloro-3,4-dihydroxybenzamido)acetyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((((2-(2-chloro-3,4-dihydroxybenzamido)ethyl)carbamoyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((4-(3,4-dihydroxybenzamido)piperidine-1-carbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((((1-(3,4-dihydroxybenzoyl)pyrrolidin-3-yl)carbamoyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((3-(3,4-dihydroxybenzamido)azetidine-1-carbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-(2-chloro-3,4-dihydroxyphenyl)-2-oxoethyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-(3,4-dihydroxyphenyl)-2-oxoethyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-chloro-3,4-dihydroxyphenyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-(2,5-dichloro-3,4-dihydroxyphenyl)-2-oxoethyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(3,4-dihydroxyphenyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-((2-chloro-3,4-dihydroxybenzoyl)oxy)ethyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2,5-dichloro-3,4-dihydroxyphenyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-((3,4-dihydroxybenzoyl)oxy)ethyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-((2-chloro-3,4-dihydroxybenzoyl)oxy)ethyl)-4,5-dihydroisoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-chloro-3,4-dihydroxyphenyl)-4,5-dihydroisoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-((2,5-dichloro-3,4-dihydroxybenzamido)methyl)-4,5-dihydroisoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-((3,4-dihydroxybenzoyl)oxy)ethyl)-4,5-dihydroisoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-((2-chloro-3,4-dihydroxybenzamido)methyl)-4,5-dihydroisoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(3,4-dihydroxybenzoyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((3,4-dihydroxybenzoyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-chloro-3,4-dihydroxybenzoyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3S,5R)-3-(((3,4-dihydroxyphenyl)amino)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-((2-(2-chloro-3,4-dihydroxybenzamido)ethoxy)imino)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-((4-(2-chloro-3,4-dihydroxybenzamido)phenoxy)imino)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(2-chloro-3,4-dihydroxybenzoyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(2-bromo-4,5-dihydroxybenzoyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3-(3,4-dihydroxyphenyl)-5-methylisoxazole-4-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3-(2-chloro-3,4-dihydroxyphenyl)isoxazole-5-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-(3-(3,4-dihydroxyphenyl)isoxazole-5-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-((4S,5R)-2-(2,3-dihydroxyphenyl)-5-methyl-4,5-dihydrooxazole-4-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(2-((4S,5R)-2-(3,4-dihydroxyphenyl)-5-methyl-4,5-dihydrooxazole-4-carbonyl)hydrazono)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3-(2,3-dihydroxyphenyl)isoxazole-5-carbonyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3-(2,3-dihydroxyphenyl)-4,5-dihydroisoxazole-5-carbonyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((4-(2-chloro-3,4-dihydroxybenzoyl)piperazine-1-carbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((3-(2-chloro-3,4-dihydroxybenzamido)azetidine-1-carbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3-(2-chloro-3,4-dihydroxyphenyl)-4,5-dihydroisoxazole-5-carbonyl)hydrazine-1-carbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-(3-(2-chloro-3,4-dihydroxyphenyl)-4,5-dihydroisoxazole-5-carbonyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(((2-((4S,5R)-2-(2,3-dihydroxyphenyl)-5-methyl-4,5-dihydrooxazole-4-carbonyl)hydrazinecarbonyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((((3,4-dihydroxyphenethyl)carbamoyl)oxy)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-(5-(3,4-dihydroxybenzoyl)isoxazol-3-yl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3S,5R)-3-((4-((E)-(2-(2-chloro-3,4-dihydroxybenzoyl)hydrazono)methyl)-1H-imidazol-1-yl)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide;

(2S,3R,5R)-3-((E)-(((1-(2-chloro-3,4-dihydroxybenzoyl)piperidin-4-yl)oxy)imino)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide; and

(2S,3R,5R)-3-((E)-(((1-(2-chloro-3,4-dihydroxybenzoyl)azetidin-3-yl)oxy)imino)methyl)-3-methyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide.

12. A pharmaceutical composition comprising a pharmaceutically effective amount of a compound of claim 11 in combination with a pharmaceutically acceptable carrier.

13. The pharmaceutical composition of claim 12 , further comprising one or more additional antibacterial agents.

14. A method of treating or preventing a microbial infection in a subject in need of such treatment by administering the pharmaceutical composition of claim 12 .