Magnetized melamine‐modified polyacrylonitrile (PAN@melamine/Fe3O4) organometallic nanomaterial: Preparation, characterization, and application as a multifunctional catalyst in the synthesis of bioactive dihydropyrano [2,3‐c]pyrazole and 2‐amino‐3‐cyano 4H‐pyran derivatives

Abstract

AbstractAn efficient magnetic polymer‐based nanomaterial was prepared in three main steps including synthesis of polyacrylonitrile (PAN), modification of PAN with melamine, and magnetization of the PAN@melamine compound by in situ construction of Fe3O4 MNPs. The novel PAN@melamine/Fe3O4 organometallic nanocomposite was well characterized by various techniques such as Fourier transform infrared (FT‐IR) spectroscopy, energy dispersive X‐ray (EDX) spectroscopy, thermogravimetric analysis (TGA), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD) pattern, and vibrating sample magnetometer (VSM) curve. Afterward, the fabricated nanocomposite was used as a heterogeneous catalyst in two multicomponent reactions (MCRs) for the synthesis of biologically active dihydropyrano[2,3‐c]pyrazole and 2‐amino‐3‐cyano 4H‐pyran derivatives. The corresponding products were obtained in excellent yields without a complicated work‐up process. Besides, the prepared nanocatalyst could be recycled and reused at least five consecutive runs in both MCRs without a considerable decline in its catalytic activity.