Asymmetric Coupling of Carbon‐Centered Radicals Adjacent to Nitrogen: Copper‐Catalyzed Cyanation and Etherification of Enamides
作者:Guoyu Zhang、Song Zhou、Liang Fu、Pinhong Chen、Yibiao Li、Jianping Zou、Guosheng Liu
DOI:10.1002/anie.202008338
日期:2020.11.9
The first copper‐catalyzed asymmetric cyanation and etherification reactions of enamides have been established, where a carbon‐centered radical adjacent to a nitrogen atom (CRAN) is enantioselectively trapped by a chiral copper(II) species. Moreover, the asymmetric cyanation of vinyl esters was disclosed as well. These reactions feature very mild reaction conditions and high functional group tolerance
CH Functionalization of Enamides: Synthesis of β-Amidovinyl Sulfones<i>via</i>Visible-Light Photoredox Catalysis
作者:Heng Jiang、Xuejiao Chen、Yan Zhang、Shouyun Yu
DOI:10.1002/adsc.201200874
日期:2013.3.11
prepare β‐amidovinyl sulfones has been developed based on the sulfonation of enamides or enecarbamates via visible‐light photoredoxcatalysis. Direct CHfunctionalizations of enamides or enecarbamates under the optimized conditions proceeded with a wide scope of substrates and remarkable selectivity to give functionalized vinyl sulfones with good to excellent yields.
scope of the reaction with respect to enamide and enecarbamate substrates by using diethyl 2‐bromomalonate for the alkylationreaction was explored, followed by an investigation of the scope of alkylating reagents used to react with the enamides and enecarbamates. The results indicated that reaction takes place with quite broad substrate scope, however, tertiary enamides with an internal CC double bond
context, the conformations and properties of N‐ethynyl‐substituted aromatic amides were investigated by DFT calculations, crystallography, and NMR spectroscopic analysis. In contrast to the cis conformational preference of N‐ethyl‐ and vinyl‐substituted acetanilides, N‐ethynyl‐substituted acetanilide favors the trans conformation in the crystal and in solution. It also has a decreased double bond character
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0562698A1
公开(公告)日:1993-09-29
Copolymers of carbon monoxide with at least two α-olefinically unsaturated compounds, which
a) have been prepared by polymerization of carbon monoxide with one or more monomers (A) of the general formula (CH₂=CR₁)-R₂ and with one or more monomers (B) chosen from the group formed by compounds of the general formulae (CH₂=CR₁)N(R₂)COR₄ and (CH₂=CR₁)CON(R₂)R₄, wherein R₁, R₂ and R₄ are hydrogen atoms and/or hydrocarbyl groups,
b) have a linear structure, and
c) are made up of units of the general formula -CO-(A')- and units of the general formula -CO-(B')-, wherein A' and B' represent monomer units originating, respectively, in monomers A and B used.
一氧化碳与至少两种α-烯烃不饱和化合物的共聚物,其中
a) 一氧化碳与一种或多种通式为 (CH₂=CR₁)-R₂ 的单体 (A) 以及一种或多种选自以下组别的单体 (B) 通过聚合反应制备。和 (CH₂=CR₁)CON(R₂)R₄ 所组成的组中选出的一种或多种单体 (B)、其中 R₁、R₂ 和 R₄ 是氢原子和/或烃基、
b) 具有线性结构,且
c) 由通式-CO-(A')-的单元和通式-CO-(B')-的单元组成,其中 A' 和 B'分别代表源自所用单体 A 和 B 的单体单元。