Tuning anion species and chain length of ligands grafted on the fiber for an efficient polymer-supported Ni(II) complex catalyst in one-pot multicomponent A3-coupling

Herein, a new series of polymer-supported Ni(II) complex catalysts with different ligand chain lengths grafted on the fiber for one-pot multicomponent A(3)-coupling reactions, is reported. The fiber catalysts were prepared conveniently from commercially available polyacrylonitrile fiber via a simple two-step procedure by polyamine-amination and nickel-chelation in water respectively, and the resulting materials from the modification and utilization processes were characterized detailedly by morphology, mechanical property, elemental analysis, FTIR spectroscopy and SEM. Moreover, the fiber-supported Ni(II) complex catalysts with chlorine anion and longer chain ligands exerted higher efficiency than short chains, and the mediated reactions showed broad applicability and proceeded smoothly to afford a number of substituted propargylamines under mild conditions. Furthermore, the newly developed fiber catalyst held high strength, good flexibility and exhibited excellent stability and recyclability (over 15 cycles), and the procedure was scalable on a gram scale in a concise spinning basket reactor with good industrialization prospect. (C) 2019 Elsevier Inc. All rights reserved.