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

K. Niknam* and A. Fatehi-Raviz

Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran

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.

Keywords: Benzimidazoles, Bis-benzimidazoles, 1,2-Phenylenediamine, Carboxylic acids, Alumina-methanesulfonic acid, Microwave irradiation