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2-Acetylbenzimidazole condensed with aldehydes to afford the 2-cinnamoyl derivatives (1 a-e). Whereas 2-acetyl- and 2-benzoylbenzimidazole added Grignard reagents at the carbonyl group, the 2-cinnamoyl derivatives (1a, b) suffered addition at the olefinic double bond to give 2a, b. Condensation of amines with 2-acetyl and 2-benzoylbenzimidazole yielded the imino compounds (4a-c). 1 a reacted with thiourea to furnish the pyrimidine (5).

Reactions with 2-Acylbenzimidazole Preparation of 2-Cinnamoylbenzimidazoles, their Reactions towards Grignard Reagents and Thiourea