title: Synthesis and antimicrobial activity of cephalosporins with a 1-pyridinium substituent carrying a 5-membered heterocycle at the C-3 position.
abstract: A series of potent antimicrobial agents have been prepared. These derivatives are cephalosporins carrying a pyridine ring substituted with a heterocycle in the C-3 position. Some of them showed excellent activity not only against Gram-negative organisms including Pseudomonas aeruginosa but also against Gram-positive ones. In view of their biological and physico-chemical properties, 7 beta-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-[4-(2 or 5-oxazolyl)-1-pyridinium]methyl-3-cephem-4-carboxylate 8f (DQ-2522) and 8g (DQ-2556) were chosen as candidates for further evaluation.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis* / Q000494:pharmacology; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D007202:Indicators and Reagents; D008826:Microbial Sensitivity Tests; D011726:Pyridinium Compounds / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D002511:Cephalosporins; D007202:Indicators and Reagents; D011726:Pyridinium Compounds