Compounds that exhibit the functionality of benzimidazole and benzothiazole have been extensively employed in the area of pharmaceuticals. 1–4 The high profile of biological applications of compounds with benzimidazole and benzothiazole structures has prompted extensive studies for their synthesis. Methods of benzimidazole synthesis include the condensation of 1, 2-phenylendiamines with carboxylic acids or their derivatives in the ...