A new ring-expansion of 2-phenylmethylene-2H-1,4-benzothiazin-3(4H)-ones (1) to give 2,3-dihydro-3-oxo-2-phenyl-1,5-benzothiazepin-4(5H)-ones (3) has been developed; an episulphonium ion intermediate could be involved.
Y. Maki, M. Sako, N. Mitsumori, S. Maeda and M. Takaya, J. Chem. Soc., Chem. Commun., 1983, 450 DOI: 10.1039/C39830000450
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