Highly Efficient and Environmentally Friendly Preparation of 14-Aryl-14H dibenzo[a,j]xanthenes Catalyzed by Tungsto-divanado-phosphoric Acid

A rapid and efficient procedure for the preparation of various aryl-14H-dibenzo[a,j]xanthenes was reported. The method developed produced excellent yields via one-pot condensation of β-naphthol with various aryl-aldehydes in the presence of Keggin vanadium substituted heteropolyacid, H5PW10V2O40, as catalyst under solvent free conditions. The present methodology therefore offered several advantages but not limited to excellent yields (82%–98%), short reaction times (30–50 min), mild reaction conditions, simple work-up, as well as the utilization of cheap and environmentally benign catalyst in the absence of organic solvents.

Graphical abstractAn environmentally benign protocol is presented for the fast and efficient preparation of aryl-14H-dibenzo[a,j]xanthenes under solvent free conditions using H5PW10V2O40 as an easily available catalyst.Figure optionsDownload full-size imageDownload as PowerPoint slide