A new nano‐magnetic core–shell Fe3O4@quillaja sapogenin/Ni (II) was synthesized and characterized thoroughly using various tests including energy‐dispersive X‐ray spectroscopy (EDS), Brunauer–Emmett–Teller (BET), thermo‐gravimetric analysis (TGA), high‐resolution transmission electron microscopy (HR‐TEM), vibrating sample magnetometer (VSM), Fourier transform infrared (FT‐IR) spectroscopy, inductively coupled plasma (ICP), X‐ray diffraction (XRD) and scanning electron microscopy (SEM). The achievements demonstrated that the proposed agents were beneficial to synthesis the derivatives of β‐aminoketone. Moreover, it was possible to recover the catalyst by means of simple magnetic decantation quickly. Besides, no reduction in the activity of the catalyst occurred, even though it was utilized in various reactions.

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