The 4-mercaptoazetidin-2-one (3a) was prepared by acid treatment of the penicillin-derived β-lactam (2); thermolysis of (3a) gave the thiazole (4), by a process which did not proceed via the thiazoline (2).
J. E. Baldwin and M. A. Christie, J. Chem. Soc., Chem. Commun., 1978, 239 DOI: 10.1039/C39780000239
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