Pd‐Senphos Catalyzed
<i>trans</i>
‐Selective Cyanoboration of 1,3‐Enynes
作者:Yuanzhe Zhang、Bo Li、Shih‐Yuan Liu
DOI:10.1002/anie.202005882
日期:2020.9.7
The first trans‐selective cyanoboration reaction of an alkyne, specifically a 1,3‐enyne, is described. The reported palladium‐catalyzed cyanoboration of 1,3‐enynes is site‐, regio‐, and diastereoselective, and is uniquely enabled by the 1,4‐azaborine‐based Senphos ligand structure. Tetra‐substituted alkenyl nitriles are obtained providing useful boron‐dienenitrile building blocks that can be further
Regioselective hydrations of 1-aryl-3-en-1-ynes using gold and platinum catalysts: selective production of 2-en-1-ones and 3-en-1-ones
作者:Bhanudas Dattatray Mokar、Rai-Shung Liu
DOI:10.1039/c4cc02786h
日期:——
Regiocontrolled hydrations of 1-aryl-3-en-1-ynes have been accomplished with IPrAuOTf and PtCl2/CO to yield 3-en-1-ones and 2-en-1-ones efficiently; our experimental data indicates that the sizes of catalysts play an important role.
Ligand-accelerating low-loading copper-catalyzed effective synthesis of (E)-1,3-enynes by coupling between vinyl halides and alkynes performed in water
作者:Peng Sun、Hong Yan、Linhua Lu、Defu Liu、Guangwei Rong、Jincheng Mao
DOI:10.1016/j.tet.2013.06.063
日期:2013.8
The useful conjugated enynes could be easily prepared via low-loading (0.0001 mol %) copper-catalyzed coupling between vinylhalides and terminal alkynes. It is noteworthy that this reaction could be preformed in water without using any co-solvents and the desired 1,3-enynes could be obtained with good yields. In the catalytic reaction, ligand-acceleration effect was markable.
Discovery of A Novel Palladium Catalyst for the Preparation of Enynes with a Copper- and Ligand-Free Sonogashira Reaction
作者:Mengmeng Huang、Yangjie Wu、Xia Mi、Yujian Feng
DOI:10.1055/s-0031-1290938
日期:2012.5
catalytic systems are tolerant in the presence of a broad variety of functional groups in the substrates. The catalytic system was found to be ineffective for vinylchloride. Moreover, it was found that (Z)-β-bromostyrene reacts with terminalalkynes with retention of the steric configuration and the transformation of most of the Z-isomer did not occur in this reaction.
基于 N,N-二甲基乙醇胺 (SP-4-1')-双 [N,N-二甲基氨基乙氧基-kN,O] 钯 (II) 的新型钯 (II) 配合物与两摩尔的 AcOH 配位,已被合成的。通过 X 射线衍射分析确定了配合物的结构。使用这种配合物作为催化剂,在没有助催化剂 CuX 和任何配体的情况下,在室温下 20 小时内,通过 Sonogashira 交叉偶联反应成功合成了一系列共轭烯炔,以中等至优异的产率得到相应的产物。优化的催化系统可以耐受底物中存在多种官能团。发现该催化体系对氯乙烯无效。而且,