Abstract magnified image A green and simple synthesis of 4‐ayrl‐3,4‐dihydro‐1H‐pyrimido[1,2‐a]benzimidazole derivatives was accomplished in excellent yields via the reaction of aryl aldehyde, 1,3‐dicarbonyl compounds and 1H‐benzo[d]imidazol‐2‐amine in ionic liquid of [bmim+][BF ]. This protocol has the advantages of easier work‐up, mild reaction conditions, high yields, and an environmentally benign procedure compared with the reported methods. J. Heterocyclic Chem., (2010).
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Yao et al. (2009) studied this question.
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