MCM-41-immobilized Schiff base-pyridine bidentate copper(I) complex as a highly efficient and recyclable catalyst for the Sonogashira reaction

摘要

A novel MCM-41-immobilized Schiff base-pyridine bidentate copper(I) complex [MCM-41-Sb, Py-CuI] was conveniently prepared from commercially available and inexpensive 3-aminopropyltriethoxysilane via immobilization on MCM-41, followed by reacting with pyridine-2-carboxaldehyde and copper(I) iodide. It was found that this heterogeneous copper complex is a highly efficient catalyst for the Sono-gashira coupling of aryl halides with terminal alkynes, affording a variety of aryl acetylenes in good to excellent yields and can be recovered by a simple filtration of the reaction solution and reused for at least 10 consecutive trials without any decreases in activity. (C) 2015 Elsevier B.V. All rights reserved.