Synthesis of 1‐amidoalkyl‐2‐naphthol derivatives using a magnetic nano‐Fe₃O₄@SiO₂@Hexamethylenetetramine‐supported ionic liquid as a catalyst under solvent‐free conditions

Abstract

Abstract Hexamethylenetetramine‐functionalized silica‐coated nano‐Fe 3 O 4 particles (MNPs@Hexamethylenetetramine) were prepared as a reusable heterogeneous catalyst using a facile process. The catalyst was synthesized and characterized using infrared, X‐ray diffraction, scanning electron microscopy, thermogravimetric analysis, and vibrating sample magnetometer. This magnetic nanocatalyst was employed as an efficient, reusable, and environmentally benign heterogeneous catalyst for the synthesis of amidoalkylnaphthol derivatives from a one‐pot three‐component condensation reaction of beta‐naphthol, aldehydes, and amides in good to excellent yields, Moreover, this catalyst can be easily recovered by using a magnetic field and directly reused for at least seven runs without sign ificant loss of its activity.