Poly(vinylimidazolum acetic acid)-entrapped nanozeolite: efficient heterogeneous catalyst for synthesis of polyhydroquinolines and 1,4-dihydropyridines
作者:Tabassom Amoli、Seyed Meysam Baghbanian
DOI:10.1007/s11164-018-3314-3
日期:2018.5
An effective method for synthesis of substituted 1,4-dihydropyridines and polyhydroquinoline derivatives by Hantzsch reaction using poly(ionic liquid)-based nanozeolite (NZ@PIL-COOH) catalyst under simple conditions is described. The new solid acid catalyst was prepared by polymerization of 3-carboxymethyl-1-vinylimidazolium in presence of modified nanozeolite, and characterized by Fourier-transform
<i>In situ</i> synthesis of SO<sub>3</sub>H supported Fe<sub>3</sub>O<sub>4</sub>@resorcinol–formaldehyde resin core/shell and its catalytic evaluation towards the synthesis of hexahydroquinoline derivatives in green conditions
作者:Aliyeh Barzkar、Alireza Salimi Beni
DOI:10.1039/d0ra06972h
日期:——
electron microscopy. The concentration of H+ loaded on the Fe3O4@SiO2@RF was reported to be 1.3 mmol g−1. The well-defined Fe3O4@SiO2@RF–SO3H core–shell heterostructures exhibited high stability, efficient recyclability (10 cycles), and promoted catalytic activity for one-pot condensation reaction between the aromatic aldehydes, dimedone, malononitrile, and ammonium acetate for the synthesis of hexahydroquinoline
原位制备了一种新型球形核@双壳酸性纳米催化剂(Fe 3 O 4 @SiO 2 @RF–SO 3 H)[RF:间苯二酚–甲醛树脂],并使用X射线衍射、傅里叶变换红外进行了完全表征光谱、振动样品磁力测定、能量色散 X 射线光谱、热重分析、透射电子显微镜和场发射扫描电子显微镜。据报道,负载在Fe 3 O 4 @SiO 2 @RF上的H +浓度为1.3 mmol g -1 。明确的Fe 3 O 4 @SiO 2 @RF–SO 3 H核壳异质结构表现出高稳定性、高效可循环性(10次循环),并促进芳香醛、双甲酮、丙二腈之间的一锅缩合反应的催化活性和乙酸铵用于合成六氢喹啉衍生物。
An efficient, catalyst- and solvent-free, four-component, and one-pot synthesis of polyhydroquinolines on grinding
作者:Satish Kumar、Poonam Sharma、Kamal K. Kapoor、Maninder Singh Hundal
DOI:10.1016/j.tet.2007.11.008
日期:2008.1
An efficient synthesis of polyhydroquinolines is achieved via a four-component reaction of aldehydes, dimedone, active methylene compounds, and ammonium acetate in one-pot under solvent-free conditions at room temperature on grinding. The present method does not involve any hazardous organic solvent or catalyst. The key advantages are the short reaction time, high yields, simple workup, and purification of products by non-chromatographic methods, i.e., by simple recrystallization from ethanol. (c) 2007 Elsevier Ltd. All rights reserved.
Cu-containing core–shell structured Fe3O4@Gelatin nanocomposite: a novel catalyst for the preparation of hexahydroquinolines
Herein, a novel copper-containing Fe3O4@Gelatin (Fe3O4@Gelatin-Cu) material is prepared, characterized and its catalytic activity is studied. Fe3O4@Gelatin-Cu was prepared through coating of natural gelatin polymer on magnetic Fe3O4 NPs followed by treatment with a copper salt. The characterization of Fe3O4@Gelatin-Cu was achieved using FT-IR, VSM, SEM, TGA, and EDX analyses. The Fe3O4@Gelatin-Cu was employed as a powerful nanocatalyst in the preparation of hexahydroquinolines under green conditions. The high yield of the desired products and good recoverability, reusability and stability of the Fe3O4@Gelatin-Cu nanocatalyst are the main advantages of this study. The combined properties of gelatin, magnetic nature and supported copper catalyst make Fe3O4@Gelatin-Cu a valuable material in the catalytic world.