title: Synthesis and beta-lactamase inhibitory activity of new 6beta-cysteinesulfonamidopenicillanic acids.
abstract: New 6beta-cysteinesulfonamidopenicillanic acids and their sulfoxides were synthesized by sulfonylation of 6beta-aminopenicillanic acid or its (S)-sulfoxide with (R)-N-benzyloxycarbonylcysteinesulfonyl chloride ethyl ester (2a, 1b) and (R)-N-benzyloxycarbonylcysteinesulfonyl chloride benzyl ester (2a, 2b). The corresponding 6beta-cysteinesulfonamidopenicillanic acids sulfones 1c and 2c were prepared by oxidation of the sulfoxides 1b and 2b with potassium permanganate in aqueous medium. When combined with ampicillin some of the compounds reduced the minimal inhibitory concentrations of ampicillin against beta-lactamase producing strains.
authors.affiliation: University of Chemical Technology and Metallurgy, Sofia, Bulgaria. lschangov@hotmail.com
authors.forename: L S
authors.initials: LS
authors.lastname: Changov
authors.forename: E D
authors.initials: ED
authors.lastname: Naydenova
authors.forename: G I
authors.initials: GI
authors.lastname: Ivanova
authors.forename: R T
authors.initials: RT
authors.lastname: Gergova
authors.forename: E E
authors.initials: EE
authors.lastname: Keuleyan
authors.forename: B V
authors.initials: BV
authors.lastname: Aleksiev
mesh_terms: D004347:Drug Interactions; D004352:Drug Resistance, Microbial; D004359:Drug Therapy, Combination / Q000494:pharmacology; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D010397:Penicillanic Acid / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D013329:Structure-Activity Relationship; D065093:beta-Lactamase Inhibitors
chemical_list: D065093:beta-Lactamase Inhibitors; D010397:Penicillanic Acid