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■ One-Pot Synthesis of 2-Substituted 3-Trifluoromethyl-3-hydroxy-1,2-benzisothiazole 1,1-Dioxides from N-Substituted Benzenesulfonamides

Masahiko Takahashi,* Kenji Ohtsuki, Tetsuya Taga, and Yasunori Chohnan

*Department of Materials Sciences, Faculty of Engineering, Ibaraki University, 4-12-1 Nakanarusawamachi, Hitachi, Ibaraki 316-8511, Japan

Abstract

N,o-Dilithiation of N-substituted benzenesulfonamides followed by the addition of ethyl trifluoroacetate gave 2-substituted 3-trifluoromethyl-3-hydroxy-1,2-benzisothiazole 1,1-dioxides in one-pot.