Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
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
Direct C(sp3)-Hfunctionalization of alkylnitriles is a low toxic and facile route to nitrile-containing compounds. In this research, the Ag2CO3-mediated nitrile methylenation of enol acetates is developed to prepare γ-ketonitriles through the direct C(sp3)-Hoxidativefunctionalization of acetonitrile. A radical pathway is proposed, and acetonitrile serves both as solvent and CN-containing radical
烷基腈的直接C(sp3)-H官能化是向含腈化合物的低毒易制毒途径。在这项研究中,开发了通过乙腈的直接C(sp 3)-H氧化功能化,由Ag 2 CO 3介导的烯醇乙酸盐腈腈甲基化反应,以制备γ-酮腈。提出了一种自由基途径,乙腈既是溶剂又是含CN的自由基源。
TBADT‐Mediated C‐C Bond Formation Exploiting Aryl Aldehydes in a Photochemical Flow Reactor
作者:Adam Cruise、Marcus Baumann
DOI:10.1002/cctc.202201328
日期:2023.1.20
Scaled Photochemical Reactions: A continuous flow approach for the photochemical synthesis of β-ketonitriles and related species is presented. This approach tolerates (hetero)aromatic substrates and uses readily available TBADT as an effective HAT catalyst reaching throughputs of up to 41 mmol/h.
缩放光化学反应:提出了一种用于光化学合成 β-酮腈和相关物种的连续流动方法。这种方法可耐受(杂)芳族底物,并使用现成的 TBADT 作为有效的 HAT 催化剂,达到高达 41 mmol/h 的吞吐量。
Nucleophilic Cyanation of Enones and Imines with Formamide as the Cyano Source
作者:Lei Luo、Hong Dai、Ming‐Qing Yang、Luo Yang
DOI:10.1002/adsc.202400482
日期:——
Conflict of Interests The authors declare no competing financial interest.