Cp*Co III -catalyzed formal [4 + 2] cycloaddition of 2-phenyl-1 H -imidazoles to afford imidazo[1,2- c ]quinazoline derivatives.

A synthetic protocol based on Cp*Co III -catalyzed C-H amidation/annulation of 2-aryl-1 H -imidazoles with 1,4,2-dioxazol-5-ones was developed to give imidazo[1,2- c ]quinazoline derivatives with broad substrate scope in moderate to good yields. The method has good prospects of application in the synthesis of imidazo[1,2- c ]quinazoline drugs.