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. 1977 Jul;20(7):961-3.
doi: 10.1021/jm00217a021.

Hydrolysis of 3-chloro-3-cephems. Intramolecular nucleophilic attack in cefaclor

J M Indelicato, A Dinner, L R Peters, W L Wilham

Hydrolysis of 3-chloro-3-cephems. Intramolecular nucleophilic attack in cefaclor

J M Indelicato et al. J Med Chem. 1977 Jul.

Abstract

The chemical reactivity of 3-chloro-3-cephems was found to be similar to that of the correspondingly substituted 7-aminocephalosporanic acids and 12-13 times greater 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 intramolecular nucleophilic attack at the beta-lactam. Loss of chlorine from 3-chloro-3-cephem may be a general reaction subsequent to beta-lactam opening.

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