Molecular iodine mediated one step synthesis of 3-substituted-6-(6- substituted-2-oxochromen-3-yl)-7H[1,2,4]triazolo[3,4-b][1,3,4]thiadiazines

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Abstract

Iodine mediated condensation of 3-acetyl-6-substitutedcoumarin (1) with 3-alkyl/aryl-4-amino-5-mercapto[1,2,4]triazoles (2) have been found to give 3-alkyl/aryl-6-(6-substituted-2-oxochromen-3-yl)-7H[1,2,4]triazolo[3,4-b][1,3,4] thiadiazines (3a-n) directly in one step. The reaction has also been carried out using microwave irradiation. This protocol is an improvement on reported methods as it occurs in a single step and avoids the use of highly lachrymatory molecular bromine.

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Jakhar, A., & Makrandi, J. K. (2010). Molecular iodine mediated one step synthesis of 3-substituted-6-(6- substituted-2-oxochromen-3-yl)-7H[1,2,4]triazolo[3,4-b][1,3,4]thiadiazines. Journal of Chemical Research, (4), 238–240. https://doi.org/10.3184/030823410X12715064952719

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