Cu-catalyzed cyanomethylation of imines and α,β-alkenes with acetonitrile and its derivatives
作者:Muhammad Siddique Ahmad、Atique Ahmad
DOI:10.1039/d0ra10693c
日期:——
We describe copper-catalyzed cyanomethylation of imines and α,β-alkenes with a methylnitrile source and provide an efficient route to synthesize arylacrylonitriles and β,γ-unsaturated nitriles. This method tolerates aliphatic and aromatic alkenes substituted with a variety of functional groups such as F, Cl, Br, Me, OMe, tert-Bu, NO2, NH2 and CO2H with good to excellent yields (69–98%). These systems
The B(C6F5)3‐catalyzed silylative reduction of conjugated nitriles has been developed to afford synthetically valuable β‐silyl amines. The reaction is chemoselective and proceeds under mild conditions. Mechanistic elucidation indicates that it proceeds by rapid double hydrosilylation of the conjugated nitrile to an enamine intermediate which is subsequently reduced to the β‐silyl amine, thus forming
已开发出B(C 6 F 5)3催化的共轭腈的甲硅烷基化还原反应,以提供具有合成价值的β-甲硅烷基胺。该反应是化学选择性的,并且在温和的条件下进行。机理说明表明,它是通过将共轭腈快速双氢化硅烷化成烯胺中间体进行的,烯胺中间体随后被还原为β-甲硅烷基胺,从而形成一个新的C(sp 3)Si键。基于这种机理上的理解,还使用大体积的硅烷建立了制备烯胺的制备途径。
Studies on the solvent dependence of the carbamic acid formation from ω-(1-naphthyl)alkylamines and carbon dioxide
aprotic solvent), the carbamic acid and a small amount of the ammonium carbamate were formed. By contrast, in MeCN (protophobic, dipolar, aprotic solvent), in benzene or CHCl3 (apolar, aprotic solvent), or in 2-PrOH or MeOH (dipolar, amphiprotic solvent), ammonium carbamates 7–9 rather than 4–6 were formed, although the ammonium bicarbonates/carbonates were competitively formed in MeOH. The ammonium carbamates
is a powerful tool for the olefination of arenes by Pd-catalysed C–H activation. However, the need for superstoichiometric amounts of toxic chemical oxidants makes the reaction unattractive from an environmental and atom-economical view. Herein, we report the first non-directed and regioselective olefination of simple arenes via an electrooxidative Fujiwara–Moritani reaction. The versatility of this
Fujiwara-Moritani 反应是通过 Pd 催化的 C-H 活化进行芳烃烯化的有力工具。然而,由于需要超化学计量的有毒化学氧化剂,因此从环境和原子经济角度来看,该反应没有吸引力。在此,我们报告了通过电氧化藤原-森谷反应实现简单芳烃的第一个非定向和区域选择性烯化。这种操作友好的方法的多功能性通过广泛的底物范围得到了证明,其中包括芳烃、杂芳烃和各种烯烃。电分析研究表明 Pd( II )/Pd( IV ) 催化循环通过Pd( III ) 中间体参与。