Novel synthesis of coumarin-containing secondary benzamide derivatives using tungstate sulfuric acid†
Abstract
An efficient synthesis of a novel class of coumarin-containing secondary benzamide derivatives has been developed via a one-pot condensation of 5,7-dihydroxy coumarins, aryl aldehydes and benzamide using tungstate sulfuric acid. Due to the use of a reusable heterogeneous catalyst and solvent-free conditions, this procedure has been established based on green chemistry principles.