Desulfation and rearrangement of tigemonam to an isoxazolidin‐5‐one and the synthesis of the rearrangement product

Abstract
The β‐lactam antibiotic Tigemonam 2 undergoes desulfation to the N‐hydroxyazetidinone 4, which rearranges to the isoxazolidin‐5‐one 6. The structure of the rearrangement product 6 was confirmed by synthesis.