Methyl 6β-(dihydro-4H-1,3,5-dioxazin-5-yl)penicillanate is converted into methyl (6S,9S)-8,8-dimethyl-2-oxo-5-oxa-7-thia-1,4-diazabicyclo[4.3.0]non-3-ene-9-carboxylate by the action of potassium permanganate in aqueous acetic acid.
J. Steele and R. J. Stoodley, J. Chem. Soc., Chem. Commun., 1982, 1215 DOI: 10.1039/C39820001215
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