title: Novel cephalosporin derivatives possessing a bicyclic heterocycle at the 3-position. Part II: Synthesis and antibacterial activity of 3-(5-methylthiazolo[4,5-c]pyridinium-2-yl)-thiomethylcephalosporin derivatives and related compounds.
abstract: A series of cephalosporin derivatives with a thiazolopyridinium group at the 3-position was synthesized and evaluated for antibacterial activity. Some of these cephalosporin derivatives having a (5-alkylthiazolo[4,5-c]pyridinium-2-yl)thiomethyl group at the 3-position showed strong activity against Gram-positive and Gram-negative bacteria, including Pseudomonas aeruginosa. Among them, 5a showed a good antibacterial spectrum in vitro, and also showed a similar or slightly superior activity to that of ceftazidime in vivo against P. aeruginosa.
authors.affiliation: Pharmaceutical Research Center, Meiji Seika Kaisha, Ltd., Yokohama, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tsushima
authors.forename: Y
authors.initials: Y
authors.lastname: Kano
authors.forename: E
authors.initials: E
authors.lastname: Umemura
authors.forename: K
authors.initials: K
authors.lastname: Iwamatsu
authors.forename: A
authors.initials: A
authors.lastname: Tamura
authors.forename: S
authors.initials: S
authors.lastname: Shibahara
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology*; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry; D002511:Cephalosporins / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology*; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D000900:Anti-Bacterial Agents; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002511:Cephalosporins