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Expedite regioselective synthesis of pyrimidobenzimidazoles
1  Indian Oil Corporation Limited, Catalyst Division, R & D Centre, Sector-13, Faridabad, Haryana121007,India

Abstract: An simple, general, efficient and greener method has been developed for one pot regioselective synthesis of pyrimido[1,2-a]benzimidazole is described. Starting from the 2-aminobenzimidazole, malononitrile and carbonyl compound, the methodology involves a ring closure by different ways based on the reaction medium was confirmed by NOE and X-ray studies.
Keywords: n/a