The hydroxymethylene oxidation state of primary metabolic precursors is maintained in the biosynthesis of the β-lactam ring of proclavaminic acid as it is in nocardicin A, but the net stereochemical course of reactions to give the azetidinone N–C-4 bond is the opposite.
D. B. Mcllwaine and C. A. Townsend, J. Chem. Soc., Chem. Commun., 1993, 1346 DOI: 10.1039/C39930001346
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