Anchoring of nickel (II) 4-pyrone Schiff-base complex in functionalized nano-silica MCM‐41 matrix: A highly effective novel heterogeneous catalyst for the catalytic clean synthesis of dihydropyrano[3,2-b]chromenediones

The discovery of nanoporous silica-MCM-41 ordered molecular sieves has introduced it as an ideal heterogeneous catalyst support, in inclusion compounds as host materials, and separation media which has been reported in various synthetic routes.1, 2 The multi-component (three reactants or more) reactions (MCRs) have been developed in organic chemistry and modern drug discovery owing to the generation of biologically active products e.g. chromenes.3 Accordingly, the providing of an eco-friendly, simple, efficient, clean, convenient, and excellent yielding synthetic procedure of chromene derivatives utilizing an environmentally and recyclable novel catalyst is desired. Thus, the Ni complex on 4-pyrone-functionalized MCM-41 nanostructures has been immobilized and utilized as a promising nano-catalyst for the clean production of dihydropyrano[3,2-b]chromene derivatives using the 3-CR of KA, dimedone, and aromatic aldehydes in an efficient solventless and green procedure. Nano-silica-MCM‐41‐4-pyrone‐Ni was prepared by the post-grafting method and characterized using XRD, ICP, EDX, BET, FT-IR, TGA, SEM, and TEM analyses.

کلیدواژه ها:

Silica-MCM‐41‐4-pyrone‐Ni ، Nanocatalyst ، Three-component condensation reaction ، Dihydropyrano[3 ، 2-b]chromene-4 ، 9-diones