1-Benzyl-3-methylimidazolium Tetrafluoroborate as an Efficient and Green Reaction Medium for the Synthesis of Pyrimido[1,2-a]benzimidazoles

A series of pyrimido[1,2-a]benzimidazole derivatives has been synthesised in high yields in the ionic liquid [bmim]+ BF4-. The structures of the products were characterised by IR, 1H NMR, and HRMS spectroscopy. The reaction work-up is simple and the ionic liquid is easily separated from the products for reuse.

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