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.
B. Karami, M. Farahi, N. Farmani and H. M. Tanuraghaj, New J. Chem., 2016, 40, 1715 DOI: 10.1039/C5NJ02463C
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