An expeditious synthesis of 2,3‐dihydroquinozoline‐4(1H)‐ones using graphene‐supported sulfonic acid.

Graphene‐supported sulfonic acid (Gr@SO3H) has been prepared by covalent grafting of (3‐mercaptopropyl)trimethoxysilane in the matrix of graphene followed by treatment with sulfuric acid and hydrogen peroxide. Gr@SO3H has been successfully characterized by Fourier transform infrared (FT‐IR) spectroscopy, Fourier transform Raman (FT‐Raman) spectroscopy, CP‐MAS 13C NMR spectroscopy, thermogravimetric analysis (TGA), energy dispersive X‐ray analysis (EDX), transmission electron microscopy (TEM), Brunauer‐Emmett‐Teller (BET) analysis, and X‐ray diffractometer (XRD) analysis. Gr@SO3H served as a robust heterogeneous catalyst for the synthesis of bioactive 2,3‐dihydroquinazolin‐4(1H)‐ones from anthranilamide and aryl aldehydes in ethanol. Recyclability experiments were executed successfully for six consecutive runs. [ABSTRACT FROM AUTHOR]