[BMIm]BF4-LiCl: An effective catalytic system for the synthesis of pyrano[3,2-c]chromene and pyrano[4,3-b]pyrone derivatives
- Young Researchers and Elites Club, Ardabil Branch, Islamic Azad University, Ardabil, Iran.
- Young Researchers and Elites Club, Rasht Branch, Islamic Azad University, Rasht, Iran.
- Chemistry Department, University of Guilan, P.O. Box 41335-19141, Rasht, Iran.
- Department of Applied Chemistry, Ardabil Branch, Islamic Azad University, Ardabil, 56157, I.R. Iran.
Abstract
An efficient and green method for the synthesis of pyrano[3,2-c]chromene or pyrano[4,3-b]pyrone derivatives is described by using a three-component condensation process of malononitrile, aldehyde, and 4-hydroxycoumarine or 4-hydroxypyrone in [BMIm]BF4-LiCl as an ionic liquid.