جستجوی مقالات مرتبط با کلیدواژه « 2-Amino-3-cyano-4H-pyran » در نشریات گروه « شیمی »

In this study, 2-amino-3-cyano-4H-pyran derivatives were prepared through the three‐component condensation reaction between dimedone, aromatic aldehydes, and malononitrile in the presence of magnetic raffinose nanocomposite as green, biocompatible, and heterogeneous catalyst. The desired products were achieved within 10-30 minutes with yields of 80-95 percent. Synthetic nanocomposite has been characterized by conventional methods including Fourier Transforms InfraRed (FT‐IR) spectroscopy, Energy Dispersive X-ray (EDX) analysis, Scanning Electron Microscopy (SEM) images, Field Emission Scanning Electron Microscopy (FESEM), Vibrating Sample Magnetometer (VSM), and X-Ray Diffraction (XRD) pattern. This protocol has advantages such as mild conditions, short reaction times, simple procedure, excellent yields of the products, and purification of the products by chromatography-free methods. The magnetic properties of the nanocomposite caused its easy separation by using the external magnetic field from the reaction mixture then the catalyst was reused at least five times without a significant decrease in its catalytic activity.

The ZnS/CuFe2O4 magnetic hybrid nanocatalyst was synthesized for the first time by a simple procedure. Investigation and characterization of this catalyst were carried out using energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) analyses. Synthetic nanoparticles were used as a magnetic and heterogeneous catalyst for the one-pot synthesis of 2-amino-3-cyano-4H-pyran derivatives with condensation of dimedone, aromatic aldehydes and malononitrile in ethanol at room temperature. The reported method has advantages such as mild conditions, good yields, simple separation of products from the reaction mixture and the use of biocompatible solvent and inexpensive catalyst. Nanocatalyst ZnS/CuFe2O4 was easily separated from the reaction using an external magnetic field and reused several times in reactions without appreciable reduction in catalytic activity.