Herein. we report the preparation of methyl 6-methyl-4-(4-nitrophenyl)-2-oxo-1. 2-dihydropyrimidine-5-carboxylate 2. obtained by the regioselective oxidative dehydrogenation of the dihydropyrimidine derivative 1 in the presence of cerium ammonium nitrate. https://www.parisnaturalfoodes.shop/product-category/smart-ginkgo/