Synthesis of water-dispersed magnetic nanoparticles (H2O-DMNPs) of β-cyclodextrin modified Fe3O4 and its catalytic application in Kabachnik–Fields multicomponent reaction

• Fe3O4@β-CD as a nanomagnetically catalyst.
• A reusable magnetic nanocatalyst synthesis using commercially available compounds.
• Represents advantages, operational simplicity, no waste, higher yield and with easy workup.

Water-dispersed magnetic nanoparticles (H2O-DMNPs) of β-cyclodextrin modified Fe3O4 were successfully synthesized. β-Cyclodextrin acts as stabilizer and structure directing agent of Fe3O4. Subsequently, the dispersion of Fe3O4@β-CD was applied for the Kabachnik–Fields multicomponent reaction through three-component synthesis of an amine, aldehyde, and dimethylphosphonate. β-CD had also a drastic effect in accelerating the catalysis of phosphonate synthesis. By this protocol, phosphonate derivatives were synthesized in high yields and the catalyst was recycled for 10 successful runs.