Use of the allylic sulphoxide–sulphenate ester rearrangement for the synthesis of a 2-thiacephem and a penem

Abstract
A 2-thioxopenam is synthesised from an acetylthio substituted penem and 2-thiacephem; the letter compound was prepared through the intramolecular nucleophilic capture of an allylic sulphenate ester, generated thermally from the corresponding sulphoxide (1).

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