Synthesis of 2-Substituted Benzimidazoles and Bis-benzimidazoles by Microwave in the Presence of Alumina-Methanesulfonic Acid

A microwave-assisted method for the synthesis of 2-substituted benzimidazoles in the presence of alumina-methanesulfonic acid (AMA) is reported. In addition, by this method some new bis-benzimidazoles from the direct reaction of phenylenediamine and dicarboxylic acid under microwave irradiation in good to excellent yields are described