Inhibition of the mammalian .beta.-lactamase renal dipeptidase (dehydropeptidase-I) by Z-2-(acylamino)-3-substituted-propenoic acids
摘要:
The title enzyme deactivates the potent carbapenem antibiotic imipenem in the kidney, producing low antibiotic levels in the urinary tract. A series of (Z)-2-(acylamino)-3-substituted-propenoic acids (3) are specific, competitive inhibitors of the enzyme capable of increasing the urinary concentration of imipenem in vivo. Many of the compounds were prepared in one step from an alpha-keto acid and a primary amide. The optimum R2 groups are 2,2-dimethyl, -dichloro, and -dibromocyclopropyl. With R2 = 2,2-dimethylcyclopropyl (DMCP), a wide variety of R3 groups including alkyl, oxa- and thiaalkyl, and alkyl groups containing acidic, basic, and neutral substituents give effective inhibitors with Ki values of 0.02-1 microM and a range of pharmacokinetic properties. By resolution of enantiomers and X-ray crystallography, the enzyme-inhibitory activity of the DMCP group was found to reside with the 1S isomer. The cysteinyl compound 176 (cilastatin, MK-0791) has the desired pharmacological properties and has been chosen for combination with imipenem.
Inhibition of the mammalian .beta.-lactamase renal dipeptidase (dehydropeptidase-I) by Z-2-(acylamino)-3-substituted-propenoic acids
摘要:
The title enzyme deactivates the potent carbapenem antibiotic imipenem in the kidney, producing low antibiotic levels in the urinary tract. A series of (Z)-2-(acylamino)-3-substituted-propenoic acids (3) are specific, competitive inhibitors of the enzyme capable of increasing the urinary concentration of imipenem in vivo. Many of the compounds were prepared in one step from an alpha-keto acid and a primary amide. The optimum R2 groups are 2,2-dimethyl, -dichloro, and -dibromocyclopropyl. With R2 = 2,2-dimethylcyclopropyl (DMCP), a wide variety of R3 groups including alkyl, oxa- and thiaalkyl, and alkyl groups containing acidic, basic, and neutral substituents give effective inhibitors with Ki values of 0.02-1 microM and a range of pharmacokinetic properties. By resolution of enantiomers and X-ray crystallography, the enzyme-inhibitory activity of the DMCP group was found to reside with the 1S isomer. The cysteinyl compound 176 (cilastatin, MK-0791) has the desired pharmacological properties and has been chosen for combination with imipenem.
2-(Cyclopropane-carboxamido)-2-alkenoic acids, their esters and salts, and antibacterial compositions comprising the same and a thienamycin-type compound
申请人:Merck & Co., Inc.
公开号:EP0048301A1
公开(公告)日:1982-03-31
ω-(2-Amino-2-carboxyethylthiol-2-(cyclopropane- carboxamido)-2-alkenoic acids, their esters and salts of the formula
in the Z configuration, wherein R2 is 2,2-dimethylcyclopropyl or 2,2-dichlorocyclopropyl; R' is hydrogen, loweralkyl of 1-6 carbon atoms, dialkylaminoalkyl with 1-6 carbon atoms in each alkyl group, or a pharmaceutically acceptable cation; R3 is an alkylene chain of 3-7 carbon atoms, having a terminal substituent which is 2-amino-2-carboxyethylthio, or 1-(phosphono)ethylamino which selectively inhibit the metabolism of dipeptidase (E.C:3.4.13.11) and therefore are useful in combination with antibacterial products, by preference with the thienamycin class of compounds.
Combination of 2-substituted penems with dipeptidase inhibitors
申请人:Merck & Co., Inc.
公开号:EP0072014A1
公开(公告)日:1983-02-16
A novel antibacterial drup combination is provided, one component being a 2-substituted penem having the structure
wherein R is -R' or -SR' wherein R' is substituted or unsubstituted: alkyl having 1-6 carbon atoms, aryl such as phenyl or phenyl alkyl having 7-12 carbon atoms, heterocyclyl or heterocyclylalkyl wherein alkyl has 1-3 carbon atoms and the heterocyclic moiety has 1-4 hetero atoms selected from 0, N, or S: and the easily removable or pharmaceutically acceptable salt or ester derivatives thereof; and the other component is a dipeptidase (E.C.3.4.13.11) inhibitor. The dual-component combination is formulated so that 1 to 3 parts by weight of the penem are employed for 30 to 1 parts by weight of the inhibitor compound.