Transition-metal-free synthesis of triarylmethanes via Friedel-Crafts reactions of imidazo[1,2-a]pyridines with chlorohydrocarbon derivatives

A facile, transition-metal-free, HFIP-promoted method for the synthesis of triarylmethanes through direct Friedel-Crafts reactions of imidazo[1,2-a]pyridines with chlorohydrocarbon derivatives has been described, which allows for efficient synthesis of triarylmethanes containing imidazo[1,2-a]pyridines in good to satisfactory yields at room temperature. This transformation features simple operation, excellent functional group tolerance, and a broad substrate scope.