A simple three-step synthesis of (2H)-1,2-benzothiazin-4(3H)-one 1,1-dioxides from saccharin has been achieved by the base-mediated ring-expansion of 3-(α-bromoalkyl)-1,2-benzisothiazole 1,1-dioxides.
R. A. Abramovitch, K. M. More, I. Shinkai and P. C. Srinivasan, J. Chem. Soc., Chem. Commun., 1976, 771 DOI: 10.1039/C39760000771
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