Letter: Biogenetic-type synthesis of penicillin-cephalosporin antibiotics. I. A stereocontrolled synthesis of the penam- and cephem-ring systems from an acyclic tripeptide equivalent.
D000215:Acylation; D002511:Cephalosporins / Q000138:chemical synthesis*; D003500:Cyclization; D008722:Methods; D009842:Oligopeptides; D010406:Penicillins / Q000138:chemical synthesis*
D002511:Cephalosporins; D009842:Oligopeptides; D010406:Penicillins