A simple and practical procedure for synthesis of 2-arylbenzimidazoles by a one-pot condensation of o-phenylenediamine with aromatic aldehydes in the presence of a catalytic amount of M(NO3)2·6H2O (M = Mn, Fe, Co, Ni, Cu) in ethanol at room temperature is described. Major advantages of this practical procedure are use of a readily available catalyst, high yields, short reaction times, and simplicity of the reaction and workup.
在催化量的 M(
NO3)2·6H2O (M = Mn、Fe、Co、Ni、描述了室温下在
乙醇中的Cu)。该实用方法的主要优点是使用容易获得的催化剂、高产率、短反应时间以及反应和后处理简单。