Sulfanilic acid-functionalized silica-coated nano-Fe3O4particles (MNPs–PhSO3H) have been prepared as a reusable heterogeneous acid catalyst using a facile process. The catalytic performance of this novel material has been studied in the synthesis of 1-amido- and 1-aminoalkyl-2-naphthol derivativesviaa one-pot three-component condensation reaction of aldehydes, 2-naphthol, and amides/urea/amines in good to excellent yields, under solvent-free classical heating conditions. The catalyst was easily separated from the reaction mixture with the assistance of an external magnetic field and reused for several consecutive runs without significant loss of its catalytic efficiency. Results obtained from transmission electron microscopy (TEM), scanning electron microscope (SEM), powder X-ray diffraction (XRD) and sample magnetometery (VSM) show that the synthesized magnetic nanocomposites are superparamagnetic with a size range of 15–30 nm
