A convenient synthesis of 1,2-benzisothiazole 1,1-dioxide from toluene-o-sulphonamide is reported, and this allows the preparation of a number of 1,2-benzothiazepine 1,1-dioxides bearing hydrogen atoms in the seven-membered ring; 1H n.m.r. spectroscopy suggests that the later is not aromatic.
R. A. Abramovitch, B. Mavunkel and J. R. Stowers, J. Chem. Soc., Chem. Commun., 1983, 520 DOI: 10.1039/C39830000520
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