Reaction of a series of aniline derivatives with chlorosulphonyl isocyanate followed by cyclisation of the resulting chlorosulphonylureas with Lewis acids gives good yields of 2H-1,2,4-benzothiazidazin-3(4H)-one 1,1-dioxides. These, upon acid hydrolysis, yield the corresponding o-aminobenzenesulphonamides.
Y. Girard, J. G. Atkinson and J. Rokach, J. Chem. Soc., Perkin Trans. 1, 1979, 1043 DOI: 10.1039/P19790001043
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