Preparation, Characterization, and Application Magnetic Fe 3 O 4 @SiO 2 @Bi 2 O 3 Nanoparticles for the Synthesis of Diindolyloxindole Derivatives

摘要: In this study, synthesis of diindolyl oxindole derivatives has been developed by the coupling indole compounds, isatin catalyzed with nanomagnetic Fe3O4@SiO2@Bi2O3. Reactions proceeded smoothly, and corresponding heterocyclic products have obtained in good to high yields. Magnetic Fe3O4@SiO2@Bi2O3 catalyst produced hydrothermal method. At first, magnetic nanoparticles Fe3O4 as core subsequently they coated SiO2; finally, third stage, Bi2O3 deposited on Fe3O4@SiO2. The synthesized characterized Fourier-transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), thermal gravimetric analysis (TGA), dispersive energy X-ray (EDS), powder diffraction, vibrating sample Magnetometry (VSM), transmission (TEM) techniques. This compared other catalysts used methods for derivatives. Using water solvent, short reaction time, recovery capability a very slight reduction efficiency product even fourth stage use are advantages application oxindoles.