Benzothiazepinones and benzoxazepinones were converted into thioamides and then into cyclic thioimidates, which were annelated to give β-lactams by treatment with an acid chloride and a weak base. Reactions of these homologues of cepham and penam with periodate led to rearrangement to 1,4-thiazonine and 1,4-oxazonine derivatives.
A. K. Bose, W. A. Hoffman and M. S. Manhas, J. Chem. Soc., Perkin Trans. 1, 1976, 2343 DOI: 10.1039/P19760002343
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