Cu nanoparticles decorated Cu organic framework based efficient and reusable heterogeneous catalyst for coupling reactions

Abstract

Cu based metal organic frameworks were prepared and investigated as heterogeneous catalysts in the multi-component coupling reaction involving phenylacetylene as one of the building block for the synthesis of indolizine. Using the same set of reactants, chalcone was synthesized in neat condition. To enhance the catalytic activity and selectivity, Cu nanoparticles decorated Cu based metal organic framework was prepared using NaBH4 as reducing agent and sodium dodecyl sulfate as capping agent. Materials were characterized by the complementary combination of X-ray diffraction, N2-adsorption, scanning/transmission electron microscopic technique, Fourier transform infrared spectroscopy, UV–vis spectroscopy, X-ray photoelectron spectroscopy, and electrochemical method. For comparative purpose, Cu cluster compound and CuO were also prepared. Recycling and leaching experiments were performed to demonstrate the sustainability and robustness of the catalytic system. A wide range of indolizine and chalcones were prepared in high yields using this catalyst.