One-Pot Multicomponent Synthesis of Pyrano[2,3-c]pyrazole and 2-Amino-4Hbenzo[ b]pyrans Catalyzed by Hercynite@SiO2@Tris as Novel and Efficient Nanocatalyst

In this study, magnetic hercynite nanoparticles (FeAl2O4, MNPs) were functionalized by cheap and readily available tris(hydroxymethyl)aminomethane (Tris) as an organocatalyst. Various techniques, including Vibrating Sample Magnetometry (VSM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Thermogravimetric Analysis (TG) were employed to determine the morphology, particle size, physical properties, and magnetic properties of the nanoparticles. Additionally, Fourier transform infrared spectroscopy (FT-IR) techniques were used to investigate the presence of the functional group. The activity of this new catalyst as a magnetically recoverable nanocatalyst was investigated in the synthesis of oxygen and nitrogencontaining heterocyclic compounds. Pyranoprazole and 2-amino-4H-benzo[b]pyrans compounds were synthesized with high efficiency in a short time. FeAl2O4@SiO2@Tris can be separated using magnetic attraction and reused up to 5 consecutive times without a significant decrease in the yield of target products or catalytic activity.