Methyl benzylpenicillinate 1,1-dioxide (1) undergoes a base-induced equilibration with its 6-epimer (2), which then isomerises to (3S,4R)-1-(1-methoxycarbonyl-2-methylprop-1-enyl)-3-phenylacetamido-4-oxoazetidine-2-sulphinic acid (3).
D. F. Corbett, C. M. Pant and R. J. Stoodley, J. Chem. Soc., Chem. Commun., 1976, 1021b DOI: 10.1039/C3976001021B
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