Fe3O4/SiO2/(CH2)3N+Me3Br3– core–shell nanoparticles: An efficient catalyst for the synthesis of functionalized 5-oxo-hexahydroquinolines
الموضوعات : Iranian Journal of CatalysisAzita Farrokhi 1 , Issa Yavari 2 , Keivan Ghodrati 3
1 - Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 - Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran.
3 - Department of Chemistry, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.
الکلمات المفتاحية: Solvent-free, Heterogeneous catalysis, Magnetically retrievable, Nanohybrid, Hantzsch condensation, 5-Oxo-hexahydroquinolines,
ملخص المقالة :
The four-component Hantzsch condensation reaction of dimedone, ethyl acetoacetate, ammonium acetate, and various aromatic and aliphatic aldehydes in the presence of catalytic amount of a magnetic nanoparticle-supported tribromide, as a green catalyst, under solvent‐free conditions at 80 °C affords functionalized 5-oxo-hexahydroquinolines in good to excellent yields. The magnetic Fe3O4-SiO2-(CH2)3N+Me3Br3–, was characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD) spectroscopy, transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). The method offers several advantages including high yields, short reaction time, simple work-up procedure and catalyst reusability for several runs. The catalyst could be readily separated by using a magnetic force and reused six times without any significant loss of catalytic activity.
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