Ionic tagged DABCO grafted on magnetic nanoparticles: a water-compatible catalyst for the aqueous aza-Michael addition of amines to α,β-unsaturated amides

Abstract

Ionic tagged 1,4-Diazabicyclo[2.2.2]octane (DABCO) grafted on magnetic nanoparticles (MNPs) was prepared and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM) and thermal gravimetric analysis (TGA). The resulting magnetic solid supported DABCO catalyst with an ionic moiety was efficient for aza-Michael addition of aliphatic amines to various α,β-unsaturated amides in water at room temperature, affording the desired products in good to excellent yields. Gratifyingly, the catalyst could be readily recovered by an external magnet and reused ten times without any significant loss of activity.