THIENOISOTHIAZOLES. I. THE SYNTHESIS OF THIENO(2,3-C)ISOTHIAZOLE AND SOME OF ITS DERIVATIVES
1982
.Thieno[2,3-c]isothiazole-3-carboxylic acid was the compound obtained by the reaction of ethyl-3-cyano-5,5-diethoxy-2-oxopentanoate with phosphorus pentasulfide, previously assumed to yield thieno[3,4-d]isothiazole-4-carboxylic acid. The parent thieno[2,3-c]isothiazole was obtained by decarboxylation of thieno[2,3-c]isothiazole-3-carboxylic acid and by deamination of thieno[2,3-c]-isothiazol-3-amine.
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