Palladium and copper-supported on charcoal: A heterogeneous multi-task catalyst for sequential Sonogashira–Click and Click–Heck reactions
摘要:
This paper describes the development of one-pot sequential Sonogashira-Click and Click-Heck reactions by using Pd-Cu/C as a heterogeneous multi-task catalyst for the synthesis of heterocyclic structures. Details of the optimization studies and the substrate scope are discussed. These methodologies allow the preparation of functionalized triazoles in simple experimental conditions with inexpensive reagents. (C) 2014 Elsevier B. V. All rights reserved.
Three-Dimensional Printing in Catalysis: Combining 3D Heterogeneous Copper and Palladium Catalysts for Multicatalytic Multicomponent Reactions
作者:Antonio S. Díaz-Marta、Carmen R. Tubío、Carlos Carbajales、Carmen Fernández、Luz Escalante、Eddy Sotelo、Francisco Guitián、V. Laura Barrio、Alvaro Gil、Alberto Coelho
DOI:10.1021/acscatal.7b02592
日期:2018.1.5
immobilized copper and palladium species on a silica support were synthesized by 3D printing and a subsequent surface functionalization protocol. The resulting 3D monoliths provided a structure with pore sizes around 300 μm, high mechanical strength, and easy catalyst recyclability. The devices were designed to perform heterogeneous multicatalytic multicomponent reactions (MMCRs) based on a copper alkyne–azide
通过3D打印和随后的表面功能化方案合成了两种固定在二氧化硅载体上的固定化铜和钯物质的3D混合整体催化剂。所得的3D整料提供的结构的孔径约为300μm,具有较高的机械强度,并且催化剂易于回收利用。该设备设计用于执行基于铜炔烃-叠氮化物环加成(CuAAC)+钯催化交叉偶联(PCCC)策略的多相多催化多组分反应(MMCR),从而可以快速组装各种取代的1,2,3-三唑使用tBuOH / H 2的混合物以O为溶剂。在这项工作中开发的可重复使用的多催化系统是实用的小型化和隔室非均质3D打印金属催化剂的示例,可以执行用于溶液化学的MMCR。
Polymer-Supported 1,5,7-Triazabicyclo[4.4.0]dec-5-ene as Polyvalent Ligands in the Copper-Catalyzed Huisgen 1,3-Dipolar Cycloaddition
New supportedcatalysts for the Huisgen’s [3+2] azide‐alkyne cycloaddition have been prepared by immobilization of copper species on commercially available polymeric matrixes incorporating the 1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene (TBD) template. The synergic exploitation of the exceptional copper chelating ability and basicity profile of the TBD framework, in addition to ensuring effective immobilization
Homogeneous and noncovalent immobilization of NHC-Cu catalyzed azide-alkyne cycloaddition reaction
作者:Xiangjie Zhang、Bingyang Wang、Yanmei Lu、Chungu Xia、Jianhua Liu
DOI:10.1016/j.mcat.2021.111452
日期:2021.3
reaction. Both were active in the two-component click cycloaddition reaction of terminalalkynes and organic azides and three-component cycloaddition reaction that employs various terminalalkynes, NaN3 and organic halides with the advantage of excellent yields, low catalyst dosage, short reaction time. The MWNTs@NHC-Cu catalyst could be separated from the reaction system at the end of the reaction and
The synthesis of an easily accessible theophylline-derived copper complex with additional ammonium functionalization has been developed.
已开发出一种易于获取的茶碱衍生铜配合物合成方法,其中还具有额外的铵功能化。
CuSO
<sub>4</sub>
nanoparticles loaded on carboxymethylcellulose/polyaniline composites: A highly efficient catalyst with enhanced catalytic activity in the synthesis of propargylamines, benzofurans, and 1,2,3‐triazoles
作者:Zhian Xu、Jinxi Xu、Yiqun Li
DOI:10.1002/aoc.6349
日期:2021.10
CuSO4NPs@CMC/PANI composites were successfully applied as catalysts in aldehyde-alkyne-amine (A3) coupling reactions, A3-cycloisomerization tandem reactions, and Cu-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. All reactions proceeded smoothly and afforded the desired products in excellent yields. Moreover, no significant decrease in catalytic ability was observed in A3 model reaction after 15 recycles