Convenient Method for the Preparation of 2-Aryl-1H-benzimidazole-4-carboxylic Acids

Abstract The oxidative cyclization of 2,3‐diaminobenzoic acid and aromatic aldehydes to give 2‐aryl‐1H‐benzimidazole‐4‐carboxylic acids is reported. Moreover, three methods were compared in different perspectives from experimental manipulation to yield.