Chemistry of cephalosporin antibiotics. 30. 3-Methoxy- and 3-halo-3-cephems
作者:Robert R. Chauvette、Pamela A. Pennington
DOI:10.1021/jm00238a017
日期:1975.4
the 3-hydroxy compounds to 3-methoxy-3-cephem derivatives. Removal of the ester-protecting group at the C4-carboxyl afforded a select group of cephalosporins with direct halo and methoxy substitution at C3. A number of these compounds are potent antibiotics.
Hydrolysis of 3-cloro-3-cephems. Intramolecular nucleophilic attack in cefaclor
作者:Joseph M. Indelicato、Alan Dinner、Lynn R. Peters、William L. Wilham
DOI:10.1021/jm00217a021
日期:1977.7
than that of the correspondingly substituted 7-aminode-acetoxycephalosporanic acids. Cefaclor, 7-(D-2-amino-2-phenylacetamido)-3-chloro-3-cephem-4-carboxylic acid, was found to undergo intramolecularnucleophilicattack at the beta-lactam. Loss of chlorine from 3-chloro-3-cephem may be a general reaction subsequent to beta-lactam opening.
An ester cleavage process for use with beta-lactams
申请人:ELI LILLY AND COMPANY
公开号:EP0557035A2
公开(公告)日:1993-08-25
The present invention provides a novel ester cleavage process for use with ß-lactams. The process is useful because of mild conditions necessary to complete the reaction, such conditions being especially suitable for ß-lactams.