One-pot synthesis of chromenes in the presence of magnetic nanocomposite based on NH2 -UiO-66(Zr), graphene oxide and Fe3O4

In this research, GO/Fe3O4/UiO-66-NH2, a new magnetically recoverable heterogeneous catalyst, was prepared and characterized using various spectroscopic techniques and elemental analysis methods. The promoting ability of GO/Fe3O4/UiO-66-NH2 was studied in the synthesis of chromenes via one-pot three-component condensation of 4-hydroxycoumarin, 2-hydroxynaphthalene-1,4-dione and aromatic aldehydes at 110 degrees C under solvent-free conditions. This new protocol is included some important features such as lower loading of the catalyst, excellent yields (88%-98%), short reaction times (5-10 min), easy work-up procedure, and easy recovery using a simple magnet. The catalyst was characterized by SEM, XRD, EDX, BET, TGA and FT-IR analysis. (C) 2022 Elsevier B.V. All rights reserved.