Sulfonylation of 1,2,3-thiadiazolecarboxylic acid amidines in the presence of a base was found to be accompanied by the Cornforth rearrangement of the 1,2,3-thiadiazole ring into 1,2,3-triazole leading to the formation of 2-substituted 1,2,3-triazoles in high yields.
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This work was supported by the Russian Foundation for Basic Research (grant 18-03-00715).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2019, 55(6), 547–553
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Beryozkina, T.V., Filimonov, V.O., Dianova, L.N. et al. Reactions of N-sulfonyl-1,2,3-thiadiazole-4-carbimidamides with sulfonyl chlorides: regiospecific synthesis and structure of 2-sulfonyl-1,2,3-triazoles. Chem Heterocycl Comp 55, 547–553 (2019). https://doi.org/10.1007/s10593-019-02494-6
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DOI: https://doi.org/10.1007/s10593-019-02494-6