Abstract
A simple and efficient procedure for the synthesis of 12-aryl- or 12-alkyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivatives has been developed via one-pot three-component reaction of 2-naphthol, aldehydes, and dimedone in the presence of ammonium oxalate as a mild and inexpensive catalyst under solvent-free conditions. The present method is operationally simple and offers several advantages such as high yields, short reaction time, economic availability of the catalyst, and simple workup.
Acknowledgments
The authors gratefully acknowledge the financial support from the Research Council of Islamic Azad University, Tehran North Branch.