Synthesis of 3,4-Dihydropyrano[c]chromenes Using Carbon Microsphere Supported Copper Nanoparticles (Cu-NP/C) Prepared from Loaded Cation Exchange Resin as a Catalyst

摘要

Aim and Objective: The present study was performed with the aim to develop an efficient and environmentallybenign protocol for the synthesis of biologically siginifcant 3, 4-dihydropyrano[c]chromenes usinga new catalytic material. The protocol involves the use of a reusable, environment friendly materials and solventswith operational simplicity.Materials and Methods: Carbon microsphere supported copper nanoparticles (Cu-NP/C) prepared from loadedcation exchange resin were synthesized, characterized with well versed analytical techniques such as XRD,SEM and Raman spectroscopy and the synthesized material was used as a catalyst for the environmentally benignsynthesis of 3,4-dihydropyrano[c]chromenes.Results: The formation of carbon microsphere supported copper nanoparticles (Cu-NP/C) prepared fromloaded cation exchange resin was confirmed by XRD, SEM and Raman spectroscopy which was employed as aheterogeneous material for the synthesis of 3,4-dihydropyrano[c]chromenes. The products formed were characterizedby the analysis of spectroscopic data - NMR, IR and mass. The safe catalytic system offers several advantagesincluding operational simplicity, environmental friendliness, high yield, and reusability of catalystand green chemical transformation.Conclusion: Herein we report an easy and efficient protocol for the one-pot synthesis of dihydropyrano[c]chromenes using environmentally benign MCR approach in ethanol as the green solvent. The methoddeveloped herein constitutes a valuable addition to the existing methods for the synthesis of titled compounds.