Dehydropeptides related to β-lactam antibiotics: a scheme for the biosynthesis of Penicillins and Cephalosporins

Abstract
Cystinylvaline and cysteinyldehydrovaline derivatives have been oxidised to isothiazolidinones, a new group of peptide derivatives; a chemically reasonable scheme for the biosynthesis of β-lactam antibiotics is presented.

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