Sourav Dey - Department of Chemistry,University of North Bengal, Dist-Darjeeling, West Bengal, India
Puja Basak - Department of Chemistry,University of North Bengal, Dist-Darjeeling, West Bengal, India
Subhajit Sarkar - Department of Chemistry,University of North Bengal, Dist-Darjeeling, West Bengal, India
Pranab Ghosh - Department of Chemistry,University of North Bengal, Dist-Darjeeling, West Bengal, India

In this work, a convenient and greener procedure for synthesizing substituted pyrano-dichromeno-dione and substituted chromeno-pyrido-pyrimidinone derivatives were explored using Sulphonated Rice Husk (SRH) as a novel bio-degradable, greener, heterogeneous catalyst. We designed an efficient pseudo three-component synthetic method for ۷-aryl/heteroaryl substituted pyranodichromene-۶, ۸-dione and ۷-aryl/heteroaryl substituted chromeno[۴, ۳-d]pyrido[۱, ۲-a]pyrimidinone derivatives using this greener catalyst (SRH) under reasonable reaction condition. The fundamental features of this procedure are the operational simplicity, hassle-free recovery of product, and reusability of the catalyst with excellent product yield (up to ۹۸%). The toxic metal-free catalyst was prepared conveniently, and characterized using different spectroscopic techniques, including Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX). Then the synthesized material was used for the greener synthetic target.

Multicomponent reaction, Aromatic aldehydes, Sulphonated rice husk, Greener catalyst