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Benzothieno(2,3-d)pyrimidines (2,3,4) and benzothieno(3,2-e)(1,3,4)triazolo(4,3-c) pyrimidines (5ac) were synthesized from the precursor 2-amino-7-oxo-4,5,6,7-tetrahydro-1-benzothiophene-3-carbonitrile 1 by employing the conven- tional method as well as the microwave irradiation technique. The precursor 2-amino-3-cyanothiophene analogue 1 was synthe- sized by employing the well-known Gewald reaction. In the present work it has been found that the microwave supported syntheses are more efficient than the conventional classical heating methods. The structures of all the compounds were ascer- tained by spectral and analytical data.

Microwave-Assisted and Conventional Synthesis of Benzothieno [3,2-e] [1,3,4] triazolo[4,3-c]pyrimidines: A Comparative Study