Synthesis, characterization and catalytic properties of cationic N-heterocyclic carbene silver complexes
作者:Deniz DEMİR ATLI
DOI:10.3906/kim-2010-26
日期:——
Three new dibenzimidazolium salts bridged by 2-methylenepropane-1,3-diyl group were synthesized. Their dinuclear N-heterocyclic carbene Ag(I) complexes were prepared by the reactions of these salts with Ag2O. The structures of the synthesized compounds were defined by nuclear magnetic resonance (NMR), Fourier-transform infrared spectroscopy (FT-IR), elemental analysis, and LC-MSMS (for complexes) techniques. Stability of the silver complexes was confirmed by 1H NMR spectroscopy. Catalytic activities of Ag(I) compounds were tested for three-component coupling reaction of some aldehydes, amines, and phenylacetylene.
Dinuclear silver-bis(N-heterocyclic carbene) complexes: Synthesis, catalytic activity in propargylamine formation and computational studies
作者:Deniz Demir Atli、Betül Şen
DOI:10.1080/00958972.2021.1972097
日期:2021.7.18
Abstract Preparation of a series of 1,1′-dialkyl-3,3′-(2-methylenepropane-1,3-diyl)dibenzimidazolium salts (alkyl = ethyl, propyl, butyl) (2a-2c) and their dinuclearbis(N-heterocycliccarbene) silver complexes (3a-3c) is reported. The silver complexes were synthesized via in situ deprotonation with Ag2O in 67-74% yields. The structural definitions of the synthesized compounds were performed by 1H
摘要 一系列1,1'-二烷基-3,3'-(2-亚甲基丙烷-1,3-二基)二苯并咪唑鎓盐(烷基=乙基、丙基、丁基)( 2a - 2c )及其双核双(N)的制备-杂环卡宾)银配合物(3a - 3c)被报道。银配合物通过原位去质子化与 Ag 2 O合成,产率为 67-74%。合成化合物的结构定义通过1 H NMR、13 C NMR、元素分析、FT-IR 以及 LC-MSMS 技术(仅适用于3a - 3c)进行。银配合物用于醛、胺和炔烃的三组分偶联反应(A3-耦合)。发现增加N-杂环卡宾配体上烷基取代基的链长导致催化性能增加。图 3c显示了最高的活性,产率为 81%,并且对于 N,N-二乙基-3-苯基丙-2-yn-1-胺形成的 TON 为 27。进行几何优化并计算化合物的几何参数。分子的理论谐波振动频率是通过 DFT/B3LYP 方法计算的,用于优化几何形状。
A novel and convenient copper-catalyzed three-component coupling of aldehydes, alkynes, and hydroxylamines leading to propargylamines
作者:Na Guo、Jian-Xin Ji
DOI:10.1016/j.tetlet.2012.03.009
日期:2012.9
The first copper-catalyzed direct three-componentcoupling reaction of aldehydes, alkynes, and hydroxylamines for the synthesis of propargylamines has been developed under mild conditions, which has the advantages of ready availability of catalyst as well as operation simplicity. The present protocol provides an appealing alternative for the construction of propargylamines in a simple and one-pot procedure