The synthesis of aminonaphtols and β-amino carbonyls in the presence of a magnetic recyclable Fe3O4@MCM-48–NaHSO4 nano catalyst

Abstract

In this study, a magnetic recyclable Fe₃O₄@MCM-48–NaHSO₄ nano catalyst was used for the synthesis of aminonaphtols with heteroaromatic amines and β-amino carbonyls during the Mannich reaction. For this purpose, magnetite nanoparticles (MNPs) and MCM-48 mesoporous-coated MNPs with a particle size lower than 11 nm were synthesized via chemical precipitation methods. Then NaHSO₄ was adsorbed on the surface of mesoporous MNPs. The prepared inorganic magnetic catalyst was characterized by FT-IR, XRD, UV-DRS, TEM, VSM and titration. Finally, the applicability of the synthesized solid acid catalyst for the catalysis of Mannich reactions was investigated.