Solvent-free synthesis of 14-aryl(alkyl)-14H-dibenzo[a,j]xanthene, 9-aryl(alkyl)- 3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-2H-xanthene-1,8-dione and 2-Amino- 5,6,7,8-tetrahydro-5-oxo-4-aryl-7,7-dimet

An efficient synthesis route to dibenzoxanthene, xanthene and benzopyran derivatives from reaction of divergent aldehydes with
-naphthol, dimedone and ethyl cyanoacetate respectively under solvent-free conditions by indium chloride as a relative inexpensive, eco-friendly, easy available, non-volatile, non-explosion, thermally robust, recyclable and easy to handle catalyst at 90°C with good to excellent yields is described. Unenhanced reaction times, simple reaction protocol and work-up, improved synthesis of these materials in the presence of this heterogeneous catalyst.