S. Tumkyavichius
Jul 1, 1995
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Journal
Chemistry of Heterocyclic Compounds
Abstract
The corresponding NN-dimethyl-N′-(thieno[2,3-b]pyrimidin-S-yl)formamidines and S-acylaminothieno[2,3d]pyrimidines have been synthesized by the reaction of ethyl 5-amino-2-substituted thieno[2, 3-d]pyrimidine-6carboxylates with (a) either the dimethylacetal of dimethylfortnamide or chloroacetyl chloride or (b) ethoxycarbonylacetyl chloride or acetic anhydride. Heating ethyl S-amino-2-methylthiothieno[2, 3-d]pyrimidine6-carboxylate with allyl isothiocyanate in pyridine gave 3-allyl-2-allylthio-7-methylthiotlzieno[2, 3-d:4, 5d′]pyrimidin-4(3H)-one.