Synthesis and characterization of Bi(III) immobilized on triazine dendrimer-stabilized magnetic nanoparticles: a reusable catalyst for the synthesis of aminonaphthoquinones and bis-aminonaphthoquinones

A new Bi(III) immobilized triazine dendrimer-stabilized magnetic nanoparticle (Fe3O4@TDSN-Bi(III)) catalyst was prepared and characterized by FT-IR, TGA, elemental analysis, FE-SEM, TEM, VSM, XRD, XPS and lCP-OES techniques. This catalyst was used efficiently for the preparation of different aminonaphthoquinones via a one-pot three-component reaction of lawsone, aldehydes and amines in EtOH as a green solvent at room temperature. This catalytic system also showed excellent activity in the synthesis of symmetric and unsymmetric bis-aminonaphthoquinones from dialdehyde and/or diamine in high yields and purity via an easy work-up procedure. The easy recovery and reusability of the catalyst make this method attractive for green chemistry.