One-pot synthesis of 2-amino-3-cyanopyridines and hexahydroquinolines using eggshell-based nano-magnetic solid acid catalyst via anomeric-based oxidation
作者:Tahere Akbarpoor、Ardeshir Khazaei、Jaber Yousefi Seyf、Negin Sarmasti、Maryam Mahmoudiani Gilan
DOI:10.1007/s11164-019-04049-y
日期:2020.2
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 as-prepared catalyst, first, was characterized using different techniques, including Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Back-titration method confirmed the loading of a high surface density of acidic group, namely 8.8 mmol HSO4 per gram of the catalyst. The catalytic property of the as-prepared catalyst was examined in the synthesis of 2-amino-3-cyanopyridines via anomeric-based oxidation (ABO), and hexahydroquinolines derivatives. High yield, short reaction time, solvent-free condition, waste to wealth, and optimization with the design of experiment are the major advantages of the present work. Taken together, these results suggest the conversion of waste to wealth products around the world and usage in organic transformation.
在本项研究中,通过欧洲联盟法规界定为危险废物的蛋壳被转化为一种有价值的催化剂,即纳米Fe3O4@(HSO4)2。所制备的催化剂首先通过多种技术进行了表征,包括傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)、能量色散X射线光谱(EDX)、场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)。反滴定法证实了催化剂表面存在高密度的酸性基团,具体为每克催化剂含有8.8 mmol HSO4。通过异头氧化(ABO)合成2-氨基-3-氰基吡啶以及六氢喹啉衍生物时,考察了所制备催化剂的催化性能。高产率、短反应时间、无溶剂条件、废物利用以及结合实验设计的优化是本工作的主要优势。综合来看,这些结果表明了废物在全球范围内的财富转化潜力,并可用于有机转化过程。