NCs, enhancing thus their attractiveness as green catalysts; ii) a catechol-based polymer coating, chosen because of its strong chelating ability towards metal ions, and its potential to be obtained from biomass (lignin depolymerization); and iii) catalytically active metal nanoparticles (Pd and Cu NPs) immobilized via in situ formation onto the polymeric shell. As-prepared Pd-based NCs successfully
磁性核-壳Fe 2 O 3 @聚合物-Pd / Cu纳米复合材料(NCs)被开发为交叉偶联反应的有效和可持续的纳米催化剂。设计的NCs包含三个成分:i)磁芯(Fe 2 O 3纳米颗粒),可以回收和再利用NCs,从而增强其作为绿色催化剂的吸引力;ii)选择一种基于邻苯二酚的聚合物涂层,因为它对金属离子具有很强的螯合能力,并且具有从生物质中获得的潜力(木质素解聚);iii)通过原位固定的催化活性金属纳米颗粒(Pd和Cu NPs)形成到聚合物壳上。制备好的基于Pd的NCs成功催化了Suzuki-Miyaura交叉偶联反应,仅20到40分钟即可达到87%至97%的产率,具体取决于芳基卤化物和硼酸衍生物。类似地,铜基NC在通过A 3合成炔丙基胺中表现出相当好的催化效率(> 80%)。苯乙炔与各种醛和胺的偶联反应。重要的是,这些NC具有良好的可重用性,在几个循环后效率没有显着降低。但是,与大多数已报道
Manganese(<scp>ii</scp>) chloride catalyzed highly efficient one-pot synthesis of propargylamines and fused triazoles via three-component coupling reaction under solvent-free condition
作者:Shakil N. Afraj、Chinpiao Chen、Gene-Hsian Lee
DOI:10.1039/c4ra03232b
日期:——
A one-pot green and highly efficient method for the synthesis of propargylamines and diastereoselective synthesis of fused triazoles via three-component coupling in the presence of manganese(II) chloride as a catalyst and a catalyst-free 1,3-dipolar cycloaddition reaction, respectively, without using a co-catalyst or activator is reported. This methodology is efficient, eco-friendly, operationally
Layered Double Hydroxide-Supported Gold Catalyst for Three-Component Aldehyde-Amine-Alkyne Coupling
作者:M. Lakshmi Kantam、B. Veda Prakash、Chinta Reddy Reddy、B. Sreedhar
DOI:10.1055/s-2005-872677
日期:——
A three-component coupling of aldehydes, amines and an alkyne to generate propargylic amines in nearly quantitative yields, using a layered double hydroxide-supported gold (LDH-AuCl4) catalyst is described. Both aromatic and aliphatic aldehydes and amines are used for the reaction. No additional co-catalyst or activator is required.
Zn(OAc)2·2H2O: a versatile catalyst for the one-pot synthesis of propargylamines
作者:Enugala Ramu、Ravi Varala、Nuvula Sreelatha、Srinivas R. Adapa
DOI:10.1016/j.tetlet.2007.07.196
日期:2007.10
An inexpensive and readily available catalyst, Zn(OAc)(2)center dot 2H(2)O is successfully evaluated for effective one-pot synthesis of propargylamines with moderate to excellent yields for most of the substrates screened, without the need of base, co-catalyst or additive in the presence of air. (C) 2007 Elsevier Ltd. All rights reserved.
Direct synthesis of two-dimensional mesoporous copper silicate as an efficient catalyst for synthesis of propargylamines
作者:Mamidi Srinivas、Pavuluri Srinivasu、Suresh K. Bhargava、Mannepalli Lakshmi Kantam
DOI:10.1016/j.cattod.2013.02.006
日期:2013.6
Ordered mesoporous two-dimensional coppersilicate catalyst (CuSBA-15) has been prepared by direct method under acidic conditions. The catalyst is characterized by XRD, nitrogen sorption and HR-TEM. The nitrogen adsorption measurement indicates that the materials possess BET specific surface area ca. 692 m(2)/g. Electron microscopy images prove that the CuSBA-15 possesses ordered structure with uniform pore channels. Further, the catalyst is utilized for three component coupling reaction of aldehydes, amines and alkynes, for the efficient synthesis of propargylamine and their derivatives. The effect of aliphatic aldehydes and solvents on corresponding products is systematically investigated. The CuSBA-15 catalyst shows excellent yields in short reaction time. (C) 2013 Elsevier B.V. All rights reserved.