寻找替代贵金属的新型加氢催化剂的主要原因是对可持续性的关注以及3d过渡金属的独特机械特性。据报道,在还原剂存在下或在高温条件下,钴前体和特定配体的几种组合可提供活性加氢催化剂。这项研究报告了一种在不存在配体或表面活性剂的情况下通过还原商业CoCl 2制备小的单分散Co(0)纳米颗粒(3-4 nm)的新方法。在烯烃,炔烃,亚胺和杂芳烃(2–20 bar H 2)的氢化中观察到高催化活性。磁性使催化剂分离和多次回收成为可能。
Direct Transformation of Terminal Alkynes into Amidines by a Silver-Catalyzed Four-Component Reaction
作者:Binbin Liu、Yongquan Ning、Matteo Virelli、Giuseppe Zanoni、Edward A. Anderson、Xihe Bi
DOI:10.1021/jacs.8b11039
日期:2019.1.30
An unprecedented conversion of terminal alkynes into N-sulfonimidamides (amidines) is reported by a silver-catalyzed, one-pot, four-component reaction with TMSN3, sodium sulfinate, and sulfonylazide. The reaction scope includes both aromatic and aliphatic alkynes. A possible cascade reaction mechanism, consisting of alkyne hydroazidation, sulfonyl radical addition, 1,3-dipolar cycloaddition by TMSN3
Copper-Catalyzed Selective Semihydrogenation of Terminal Alkynes with Hypophosphorous Acid
作者:Huanyang Cao、Tieqiao Chen、Yongbo Zhou、Daoqing Han、Shuang-Feng Yin、Li-Biao Han
DOI:10.1002/adsc.201300916
日期:2014.3.10
A novel copper‐catalyzed selective semihydrogenation of terminal alkynes using hypophosphorous acid as hydrogen donor took place efficiently to afford the corresponding alkenes in high yields. A broad range of substituted terminal aromatic and aliphatic alkenes, including terminal dienes and enynes bearing internal triplebonds, can be efficiently synthesized by this reaction.
Silver-Catalyzed Stereoselective Aminosulfonylation of Alkynes
作者:Yongquan Ning、Qinghe Ji、Peiqiu Liao、Edward A. Anderson、Xihe Bi
DOI:10.1002/anie.201705122
日期:2017.10.23
A silver-catalyzed intermolecular aminosulfonylation of terminal alkynes with sodium sulfinates and TMSN3 is reported. This three-component reaction proceeds through sequential hydroazidation of the terminal alkyne and addition of a sulfonyl radical to the resultant vinyl azide. The method enables the stereoselectivesynthesis of a wide range of β-sulfonyl enamines without electron-withdrawing groups
Silver‐Catalyzed Oxyphosphorylation of Unactivated Alkynes
作者:Binbin Liu、Qingmin Song、Zhaohong Liu、Zikun Wang
DOI:10.1002/adsc.202100226
日期:2021.7
Here, we describe an application of hydroazidation in the instant activation of alkynes for achieving the oxyphosphorylation of unactivated alkynes with diarylphosphinoyl radicals under mild reaction conditions. This reaction provides a method for accessing β-ketophosphine oxides and phosphorus-containing pyrroles.
An efficient method for the synthesis of 3-substituted isocoumarins that are an important class of biologically active scaffolds via annulation of 2-bromobenzoic esters with terminal alkynes by copper catalyzed is described. The advantages of this method include mild reaction conditions, high yield and regioselectivity, and wide tolerance toward functional groups.