title: 7-N-amidinocephalosporins.
abstract: 7-Aminocephalosporanic acid tert-butyl ester reacts quantitatively at--20 degrees with iminium chlorides to give amidino derivatives. Removal of the tert-butyl protecting group with trifluoroacetic acid and treatment with 1 equiv of triethylamine yield the corresponding zwitterions. These compounds were less active than their penicillin analogs.
mesh_terms: D000578:Amidines / Q000138:chemical synthesis / Q000494:pharmacology; D002511:Cephalosporins / Q000138:chemical synthesis* / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D011513:Proteus mirabilis / Q000187:drug effects; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013210:Staphylococcus / Q000187:drug effects
chemical_list: D000578:Amidines; D002511:Cephalosporins