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Magnetic‐based picolinaldehyde–melamine copper complex for the one‐pot synthesis of hexahydroquinolines via Hantzsch four‐component reactions
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A picolinaldehyde–melamine copper complex was loaded on a magnetic Fe3O4 core, so that it contained 0.33 mmol of Cu per gram, and was used as an efficient catalyst. The as‐synthesized catalyst was characterized using various techniques, including Fourier transform infrared spectroscopy, X‐ray diffraction, energy‐dispersive X‐ray spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry and thermogravimetric analysis. The catalyst was used to activate the raw materials in the synthesis of hexahydroquinoline derivatives in one‐pot four‐component reactions. Low reaction time (minutes versus half an hour), solvent‐free condition and magnetically separable catalyst are some salient features of the developed catalyst. Also, the optimum amount of catalyst and temperature were determined as 0.07 g and 87.6 °C, respectively, which were obtained using response surface methodology and optimization techniques. 相似文献
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Akbarpoor Tahere Khazaei Ardeshir Seyf Jaber Yousefi Sarmasti Negin Gilan Maryam Mahmoudiani 《Research on Chemical Intermediates》2020,46(2):1539-1554
Research on Chemical Intermediates - In the present research, the eggshell as a hazardous waste by European Union regulations was converted to a valuable catalyst, namely nano-Fe3O4@(HSO4)2. The... 相似文献
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Mahmoudiani Gilan Maryam Khazaei Ardeshir Sarmasti Negin 《Research on Chemical Intermediates》2021,47(5):2173-2188
Research on Chemical Intermediates - Eggshell as a solid waste was loaded on a nano-Fe3O4 surface. Then, in one step, it (Fe3O4@eggshell) was converted to Fe3O4@Ca3(PO4)2 as a nano-magnetic, green,... 相似文献
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Ayoub Taavoni‐Gilan 《中国化学会会志》2019,66(6):600-607
In this study, we synthesized ofloxacin‐loaded MnFe2O4 nanoparticles (NPs) surface modified with chitosan (CS‐MnFe2O4) for prolonged antibiotic release in a controlled manner. It was found that the synthesized CS‐MnFe2O4 was spherical in shape with an average size of 30–50 nm, low aggregation, and good magnetic responsibility. An in vitro drug loading and release kinetics study reveals that the drug delivery system can take 86% of drug load and can release ofloxacin over a sustained period of 3 days. The release kinetics study reveals that the drug follows zero order kinetics and the mechanism of drug release is diffusion‐controlled type. These results indicated that CS‐MnFe2O4 NPs with pH‐sensitive properties can be used as candidates for intestinal targeted drug delivery through oral administration by avoiding the drug release in the highly acidic gastric fluid region of the stomach. 相似文献
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