ompg-C3N4/SO3H: an efficient and recyclable organocatalyst for the facile synthesis of 2,3-dihydroquinazolin-4(1H)-ones

In the present work, sulfonated highly ordered mesoporous graphitic carbon nitride (ompg-C3N4/SO3H) was synthesized successfully and employed as an efficient and reusable heterogeneous solid acid catalyst for the rapid and one-pot synthesis of 2,3-dihydroquinazolin-4(1H)-ones via the condensation of anthranilamide with aldehydes or ketones in good to excellent yields. The organocatalyst was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectrometer, Brunauer–Emmett–Teller surface area, and thermal gravimetric and differential thermal analysis. The substantial advantages of this procedure involve short reaction times, high catalytic activity, easy workup, high purity of the products, and easy recovery and reusability of the catalyst.