1. Department of Chemistry, School of Sciences, Ferdowsi University, Mashhad 91775‐1436, Iran;2. Department of Chemistry, School of Sciences, Islamic Azad University, Mashhad, Iran;3. Department of Chemistry, School of Sciences, Islamic Azad University, Ahvaz Branch, Ahvaz, Iran
Abstract:
Cyclocondensation of orthophenylendiamines with 3‐bromopropionic acid in PPA afforded 2‐vinylbenzimidazoles which were subsequently converted to their corresponding 2‐(1,2‐dibromoethyl)‐1H‐benzimidazoles on treatment with bromine. Reaction of these compounds with aryl nitriles or aryl isocyanates in basic chloroform yielded 1‐arylpyrimido1,6‐a]benzimidazoles and 2‐arylpyrimido1,6‐a]‐benzimidazol‐3‐ones respectively.
