A SIMPLE KHSO_4 PROMOTED SYNTHESIS OF 2-ARYLSUBSTITUTED BENZIMIDAZOLES BY OXIDATIVE CONDENSATION OF ALDEHYDES WITH o-PHENYLENEDIAMINE

摘要

KHSO4 is used to promote the oxidative condensation of o-phenylenediamine with aldehydes in DMF and afford corresponding 2-substituted benzimidazoles efficiently.Simple and convenient procedure,use of inexpensive promoter,easy purification and shorter reaction time are the advantageous features of this method.