A New Cyclisation of Sulfenylated Dimethyl Sulfoxide and Thiosemicarbazone Adducts using Thionyl Chloride†

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Lal Dhar S. Yadav and Daya R. Pal


Abstract

Adducts (4a–d) obtained by nucleophilic addition of sulfenylated dimethyl sulfoxide derivatives (2a,b) to thiosemicarbazones (3a,b) undergo a new intramolecular cyclisation, involving deoxygenative demethylation, to yield 5-sulfenylated 4-aryl-2-thiocarbamoyl-1,2,3-thiadiazolidines (7a–d) on treatment with thionyl chloride.


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