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AN UNEXPECTED SYNTHESIS OF β-AMINO-α-MESYL-γ-SULTAMS UPON MESYLATION OF HINDERED α-AMINONITRILES

Maksim S. Dyachenko, Alexey V. Dobrydnev, Yaroslav O. Chuchvera, Svitlana V. Shishkina, Yulian M. Volovenko
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Abstract


We report one-pot procedure for an unexpected synthesis of previously unknown 4-amino-5-methylsulfonyl-2,3-dihydroisothiazole 1,1-dioxides (also called β-amino-α-mesyl-γ-sultams). Thus, the reaction of mesyl chloride with hindered α-aminonitriles is accompanied by the formation of interim N-(1-cyanoalkyl)(methylsulfonyl)methanesulfonamides which, in turn, undergo the сarbanion-mediated sulfonate (sulfonamido) intramolecular cyclization reaction yielding β-amino-α-mesyl-γ-sultams. The structure of the title compounds was confirmed by X-ray diffraction study. The proposed mechanistic insights of the reaction are in accordance with the results of additional experiments and literature data.

Keywords


aminonitriles; spiro compounds; sulfonamides; cyclization; X-ray study

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