Efficient, High-Yield Protocol for the One-Pot Synthesis of Benzopyran Derivatives Catalyzed by p-TSA in Aqueous Media

Abstract

A short and simple synthesis of benzopyran derivatives was accomplished in good to excellent yields by the reaction of salicylaldehyde with 1,3-cyclohexanediones in aqueous media catalyzed by para-toluenesulfonic acid. The structures were established by spectroscopic data and further confirmed by x-ray analysis. In addition, water was chosen as a green solvent.

GRAPHICAL ABSTRACT

Keywords:

• 1,3-Cyclohexanediones
• one-pot synthesis
• p-TSA
• salicylaldehyde
• water

ACKNOWLEDGMENTS

The authors are thankful to the director of the Indian Institute of Chemical Technology (IICT) and head of the Organic Chemistry Division II, IICT, for their constant encouragement and support. S. C. K. thanks the Council of Scientific and Industrial Research, New Delhi, for the award of a fellowship.

Notes

^a Isolated yields.