Facile Synthesis of γ‐Ketonitriles in Water via C(sp
<sup>2</sup>
)–H Activation of Aromatic Aldehydes over Cu@g‐C
<sub>3</sub>
N
<sub>4</sub>
under Visible‐Light
作者:Vijai K. Rai、Fooleswar Verma、Smita R. Bhardiya、Harendra Sheshma、Ankita Rai、Manorama Singh
DOI:10.1002/ejoc.202000945
日期:2020.9.30
Photocatalytic synthesis of γ‐ketonitriles using various aromaticaldehydes and acrylonitrile is disclosed. The reaction is catalyzed by Cu@g‐C3N4 in waterundervisible‐light reaction conditions at room‐temperature.
公开了使用各种芳族醛和丙烯腈光催化合成γ-乙腈。在室温下可见光反应条件下,Cu @ g‐C 3 N 4在水中催化该反应。
Copper-Catalyzed Decarboxylative Oxyalkylation of Alkynyl Carboxylic Acids: Synthesis of γ-Diketones and γ-Ketonitriles
作者:Yi Li、Jia-Qi Shang、Xiang-Xiang Wang、Wen-Jin Xia、Tao Yang、Yangchun Xin、Ya-Min Li
DOI:10.1021/acs.orglett.9b00520
日期:2019.4.5
A novel copper-catalyzed decarboxylative oxyalkylation of alkynyl carboxylic acids with ketones and alkylnitriles via direct C(sp3)–H bond functionalization to construct new C–C bonds and C–O double bonds was developed. This transformation is featured by wide functionalgroup compatibility and the use of readily available reagents, thus affording a general approach to γ-diketones and γ-ketonitriles
An unprecedented tandem trifluoromethylsilylation/intramolecular SN2 substitution sequence was realized by using bifunctional reagent Me2(CH2Cl)SiCF3, allowing efficient construction of valuable trifluoromethylated oxasilacyclohexanes that are difficult to access by known methods. Initial attempts into developing asymmetric variant reveal that using cinchonine-derived dimeric PTC catalyst could afford
通过使用双功能试剂 Me 2 (CH 2 Cl)SiCF 3实现了前所未有的串联三氟甲基硅烷化/分子内 S N 2 取代序列,从而可以高效构建已知方法难以获得的有价值的三氟甲基化硅氧烷环己烷。开发不对称变体的初步尝试表明,使用辛可宁衍生的二聚 PTC 催化剂可以提供高达 92% 对映体过量的手性硅氧烷环己烷。
Unactivated C(sp<sup>3</sup>)–H Bond Functionalization of Alkyl Nitriles with Vinylarenes and Mechanistic Studies
The first example of a metal-free unactivated C(sp(3))-H bond functionalization of alkyl nitriles with terminal vinylarenes to provide gamma-ketonitrile derivatives is described. This protocol features simple operations, a broad substrate scope, and atom and step economy. In addition, Cu-catalyzed C(sp(3))-H bond functionalization of azodi-isobutyronitrile (AIBN) and analogues with terminal vinylarenes to generate gamma-ketonitriles was also studied. A preliminary free-radical pathway was confirmed by capturing an alkyl radical, and a conjugate system was found that can stabilize radical intermediates and be in favor of this transformation. Density functional theory (DFT) calculations also provide important evidence of the free-radical pathway.
Liu, Yongjun; Zhang, Yongmin, Journal of Chemical Research, 2004, # 2, p. 163 - 164