ZnFe 2 O 4 @SiO 2 ‐ascorbic acid: Green, magnetic, and versatile catalyst for the synthesis of chromeno[2,3‐d] pyrimidine‐8‐amine and quinazoline derivatives

In this research project, silica‐modified ZnFe 2 O 4 magnetic nanoparticles were prepared in a simple, short, and straightforward way. Subsequently, an efficient catalyst through immobilization of ascorbic acid on the surface of silica‐coated ZnFe 2 O 4 nanoparticles has been produced. The physical and chemical properties of ZnFe 2 O 4 @SiO 2 ‐ascorbic acid were considered by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Energy‐dispersive X‐ray spectroscopy (EDS), and vibrating sample magnetometer (VSM) analyses. The catalytic activity of described magnetic nanocatalyst was checked out for the synthesis of chromeno[2,3‐d] pyrimidine‐8‐amine and quinazolinone derivatives. The described catalyst was recovered and reused for five continuous cycles without considerable change in its catalytic activity.