polymer-incarcerated (PI) Pdcatalyst bearing an active phosphine ligand has been developed. This catalyst was prepared easily according to a conventional PI method (microencapsulation and cross-linking of polymer chains), and TEM images of PI Pd showed the formation of small Pd clusters dispersed on the polymer support without formation of Pd aggregates. The catalyst showed high activity in amination reactions of
已经开发出一种带有活性膦配体的新型聚合物包埋 (PI) Pd 催化剂。根据传统的 PI 方法(聚合物链的微囊化和交联),该催化剂很容易制备,PI Pd 的 TEM 图像显示形成分散在聚合物载体上的小 Pd 簇,而没有形成 Pd 聚集体。该催化剂在各种芳基氯与胺的胺化反应中表现出高活性。反应在不添加任何外部膦配体的情况下进行,通过简单过滤定量回收催化剂,并在不损失活性的情况下重复使用至少3次。
Selective C-C bonds formation, N-alkylation and benzo[d]imidazoles synthesis by a recyclable zinc composite
作者:Guanxin Zhu、Zheng-Chao Duan、Haiyan Zhu、Dongdong Ye、Dawei Wang
DOI:10.1016/j.cclet.2021.06.060
日期:2022.1
reaction, dehydrogenation and heterocycles synthesis, instead of noble metals. The uniformly dispersed zinc composites were designed, synthesized and carefully characterized by means of XPS, EDS, TEM and XRD. The resulting zinc composite showed good catalytic activity for the N-alkylation of amines with amines, ketones with alcohols in water under base-free conditions, while unsaturated carbonyl compounds
Expanding Pd-Catalyzed C−N Bond-Forming Processes: The First Amidation of Aryl Sulfonates, Aqueous Amination, and Complementarity with Cu-Catalyzed Reactions
作者:Xiaohua Huang、Kevin W. Anderson、Danilo Zim、Lei Jiang、Artis Klapars、Stephen L. Buchwald
DOI:10.1021/ja035483w
日期:2003.6.1
The first general method for the Pd-catalyzedamination of aryl tosylates and benzenesulfonates was developed utilizing ligand 1, which belongs to a new generation of biaryl monophosphine ligands. In addition, the new catalyst system for the first time enables amidation of aryl arenesulfonates and aqueousamination protocols that do not necessitate the use of cosolvents. The substrate scope has been
Pd催化芳基甲苯磺酸酯和苯磺酸酯胺化的第一种通用方法是利用配体1开发的,该配体属于新一代联芳基单膦配体。此外,新的催化剂系统首次实现了芳基芳烃磺酸盐的酰胺化和不需要使用助溶剂的水性胺化方案。底物范围已显着扩大到包括含有伯酰胺和游离羧酸基团的芳基卤化物。在多功能基板的情况下,Pd 催化的胺化可以提供与 Cu 催化的 CN 键形成过程互补的选择性。
Alcohol Amination Catalyzed by Copper Powder as a Self‐Supported Catalyst
作者:Yajuan Wu、Yongji Huang、Xingchao Dai、Feng Shi
DOI:10.1002/cssc.201801877
日期:2019.7.5
Catalytic alcohol amination is a sustainable reaction for N‐alkyl amine synthesis. Homogeneous and supported copper catalysts have long been studied for this reaction and have given some impressive results. In this study, copper powder is found to behave as an active catalyst for alcohol amination, giving better catalyticperformance than metal‐oxide‐supported nanocopper catalysts. Catalyst characterization
Base-mediated cascade amidination/<i>N</i>-alkylation of amines by alcohols
作者:Chunyan Zhang、Zuyu Liang、Fenghong Lu、Xiaofei Jia、Guoying Zhang、Mao-Lin Hu
DOI:10.1039/d0cc04831c
日期:——
amidination/N-alkylation reaction of amines by alcohols has been developed. For the first time, nitriles have been identified as an efficient and benign water acceptor reagent in N-alkylation. Notably, the procedure tolerates a series of functional groups, such as methoxyl, halo, vinyl and hetero groups, providing a convenient method to construct different substituted diamino compounds, 15N labeled