Nanoparticles Poly Ethylene Imine-Functionalized MCM- as a Solid Catalyst for Multi-Component Reactions

Abstract

A novel magnetically immobilized polyethyleneimine (PEI)<br />fabricated by covalently anchoring on MCM-41 (MCM-41@PEI)<br />was prepared. The synthesized catalyst was characterized by Fourier<br />transform infrared (FT-IR), thermogravimetric analysis (TGA), X-ray<br />powder diffraction (XRD), scanning electron microscopy (SEM) and<br />transmission electron microscopy (TEM). The immobilized PEI was<br />shown to be an efficient heterogeneous catalyst for the synthesis of<br />spiro-oxindole and benzopyranes derivatives via multi-component<br />reaction (MCR), in ethylene glycol as a green solvent. No leaching<br />problem was observed after several runs, while the catalyst can be<br />recovered and reused without loss of reactivity under the described<br />reaction conditions.