An efficient route to biaryls from aryl halides catalysed by subnanometrical 2,2′-bipyridine liganded Ni–Al clusters
摘要:
It has been shown that the new 2,2'-bipyridine liganded Ni-Al bimetallic clusters are efficient in promoting the catalytic homocoupling of (het)aryl chlorides and bromides. (C) 2001 Elsevier Science Ltd. All rights reserved.
Practical Catalytic Cleavage of C(sp
<sup>3</sup>
)−C(sp
<sup>3</sup>
) Bonds in Amines
作者:Wu Li、Weiping Liu、David K. Leonard、Jabor Rabeah、Kathrin Junge、Angelika Brückner、Matthias Beller
DOI:10.1002/anie.201903019
日期:2019.7.29
The selective cleavage of thermodynamically stable C(sp3)−C(sp3) single bonds is rare compared to their ubiquitous formation. Herein, we describe a general methodology for such transformations using homogeneous copper‐based catalysts in the presence of air. The utility of this novel methodology is demonstrated for Cα−Cβ bond scission in >70 amines with excellent functional group tolerance. This transformation
Nickel-catalysed sequential amination of aryl- and heteroaryl di- and trichlorides
作者:Christophe Desmarets、Raphaël Schneider、Yves Fort
DOI:10.1016/s0040-4020(01)00730-x
日期:2001.9
Unsymmetrical 1,3-diaminobenzenes and diaminopyridines were efficiently prepared by reaction of 3-chloroanilines and chloroaminopyridines with amines via a nickel-catalysedamination. The Ni/2,2′-bipyridine catalyst is also effective for the sequential amination of aryl trichlorides. After a first selective monoamination of 1,3,5-trichlorobenzene, the obtained 3,5-dichloroanilines were subsequently transformed
Visible‐Light‐Mediated Aerobic Oxidative C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
)−C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
) Bond Cleavage of Morpholine Derivatives Using 4CzIPN as a Photocatalyst
作者:Chun‐Lin Dong、Lan‐Qian Huang、Zhi Guan、Chu‐Sheng Huang、Yan‐Hong He
DOI:10.1002/adsc.202100455
日期:2021.8.3
Herein, a metal-free strategy for the aerobic oxidative cleavage of the inert C(sp3)−C(sp3) bond was developed. Deconstruction of morpholine derivatives was conducted using visible light as an energy source and O2 as an oxidant under mild conditions. This procedure demonstrated suitable selectivity and functional group tolerance. Moreover, a possible mechanism involving a radical process was proposed
Amination of Aryl Halides Mediated by Electrogenerated Nickel from Sacrificial Anode
作者:Farah Daili、Stéphane Sengmany、Eric Léonel
DOI:10.1002/ejoc.202100194
日期:2021.5.7
C(sp2)−N bond formation only mediated by nickel salts electrogenerated from the sacrificial anode has been investigated for the first time to prepare functionalized arylamine derivatives. The cross‐couplings are performed under constant current electrolysis, in an undivided cell, and without additional ligand at room temperature.
Three-Component Reactions of Arynes, Amines, and Nucleophiles via a One-Pot Process
作者:Gyoungwook Min、Jeongseob Seo、Haye Min Ko
DOI:10.1021/acs.joc.8b01058
日期:2018.8.3
An unprecedented three-component reaction of arynes, tertiary amines, and nucleophiles has been demonstrated through ammonium salt intermediates. This protocol allows access to tertiary aniline derivatives containing the piperazine motif in good-to-excellent yields. Expansively, this reaction can produce biologically important 2-(4-phenylpiperazin-1-yl)ethyl-containing molecules using arynes, 1,4-diazabicyclo(2