Application of 1‐methyl imidazole‐based ionic liquid‐stabilized silica‐coated Fe3O4 as a novel modified magnetic nanocatalyst for the synthesis of pyrano[2,3‐d]pyrimidines
Journal of the Chinese Chemical Society Vol. 66, No. 3, 307–315
چکیده
1‐Methyl imidazole‐based ionic liquid‐stabilized silica‐coated Fe3O4 magnetic nanoparticles [Fe3O4@SiO2@(CH2)3‐1‐methyl imidazole]HSO4 as a solid acid magnetic nanocatalyst was explored in the synthesis of pyrano[2,3‐d]pyrimidine derivatives. Pyrano[2,3‐d]pyrimidine derivatives were synthesized by a highly efficient three‐component reaction of various benzaldehydes, malononitrile, and barbituric acid. The catalyst was characterized by using various analysis techniques such as Fourier transform infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD), differential scanning calorimetry‐thermogravimetry analysis (DSC‐TGA), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM).