Synthesis of thieno- and furo-pyrimidinethiones

Abstract
Substituted thiophens carrying adjacent amino- and cyano-groups have been converted into the corresponding pyrimidinethione derivatives in 30–70% yield by condensation with thioamides. Acylation of the thiophen followed by cyclisation in acidic solution gave the corresponding pyrimidones. The same reactions were used successfully with analogous furan compounds.

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