A Keggin heteropoly acid as an efficient catalyst for an expeditious,one-pot synthesis of 1-methyl-2-(hetero)arylbenzimidazoles

摘要

The Keggin heteropoly acid,silicotungstic acid,H4SiW_(12)O_(40),has been demonstrated to be highly efficient for an expeditious,one-pot synthesis of 1-methyl-2-(hetero)arylbenzimidazoles from N-methyl-1,2-phenylenediamine and(hetero)aryl aldehydes in ethyl acetate at room temperature.The catalyst works equally well for N-phenyl-1,2-phenylenediamine.