Chemical‐Reductant‐Free Electrochemical Deuteration Reaction using Deuterium Oxide
作者:Xu Liu、Ruoyu Liu、Jiaxing Qiu、Xu Cheng、Guigen Li
DOI:10.1002/anie.202005765
日期:2020.8.10
We report a method for the electrochemical deuteration of α,β‐unsaturated carbonyl compounds under catalyst‐ and external‐reductant‐free conditions, with deuteration rates as high as 99 % and yields up to 91 % in 2 h. The use of graphite felt for both the cathode and the anode was key to ensuring chemoselectivity and high deuterium incorporation under neutral conditions without the need for an external
Aerobic Oxidative Amidation of Aromatic and Cinnamic Aldehydes with Secondary Amines by CuI/2-Pyridonate Catalytic System
作者:Mingwen Zhu、Ken-ichi Fujita、Ryohei Yamaguchi
DOI:10.1021/jo301553v
日期:2012.10.19
A simple and convenient CuI/2-pyridonate catalytic system for the oxidative amidation of aldehydes with secondary amines has been developed. With this system, a variety of useful arylamides have been synthesized in moderate to good yields in the presence of small amount of copper catalyst and the pyridonate ligand, generating only water as a coproduct. Synthesis of cinnamamides was also achieved by
N-fluorobenzenesulfonimide (NFSI) and its analogues as both nitrogen source and oxidant was successfully disclosed. A variety of alkenes, including aliphatic alkenes, styrenes, α, β-unsaturated esters, amides, acids, as well as enones, were all compatible to provide desired amination products. Mechanistic experiments suggest that the reaction underwent a metal-hydride-mediated hydrogen atom transfer (HAT) with alkene
Chloroform as a Carbon Monoxide Precursor: <i>In</i> or <i>Ex Situ</i> Generation of CO for Pd-Catalyzed Aminocarbonylations
作者:Samuel N. Gockel、Kami L. Hull
DOI:10.1021/acs.orglett.5b01385
日期:2015.7.2
Conditions for the rapid hydrolysis of chloroform to carbonmonoxide (CO) using heterogeneous CsOH·H2O are described. CO and 13CO can be generated cleanly and rapidly under mild conditions and can be captured either in or ex situ in palladium-catalyzedaminocarbonylationreactions. Utilizing only 1–3 equiv of CO allows for the aminocarbonylation of aryl, vinyl, and benzyl halides with a wide variety
Copper(I)-Catalyzed Asymmetric 1,4-Conjugate Hydrophosphination of α,β-Unsaturated Amides
作者:Yan-Bo Li、Hu Tian、Liang Yin
DOI:10.1021/jacs.0c09654
日期:2020.11.25
hydrophosphination of α,β-unsaturated amides is accomplished by virtue of the strong nucleophilicity of copper(I)-PPh2 species, which provides an array of chiral phosphines bearing an amide moiety in high to excellent yields with excellent enantioselectivity. Furthermore, the dynamic kinetic resolution of unsymmetrical diarylphosphines (HPAr1Ar2) is successfully carried out through the copper(I)-catalyzed conjugate