title: Studies on beta-lactam antibiotics. I. Synthesis and in vitro anti-pseudomonal activity of 3-isothiazole-cephalosporin derivatives.
abstract: The synthesis and in vitro activity of 7 beta-[(Z)-2-(2-amino-4-thiazolyl)-2-(2-carboxy-2- alkoxyimino)acetamido]cephalosporins with a (4-carboxy-3-hydroxy-5-isothiazolyl)thiomethyl group at the 3-position are described. These cephalosporins (9a approximately 9i) showed excellent activity against Gram-negative bacteria including beta-lactamase producing strains. The most interesting compound of the series was 7 beta-[(Z)-2-(2-amino-4-thiazolyl)-2- (2-carboxy-2-propoxyimino)acetamido]-3-cephem-4-carboxylic acid (9g, YM-13115) because of its outstanding inhibitory potency against Pseudomonas aeruginosa and highly prolonged plasma half-life in rats.
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D002511:Cephalosporins / Q000138:chemical synthesis* / Q000494:pharmacology; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D013055:Spectrophotometry, Infrared; D013329:Structure-Activity Relationship; D013844:Thiazoles / Q000138:chemical synthesis / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D013844:Thiazoles