visible‐light‐driven, copper‐catalyzed three‐component radical cross‐coupling of oxime esters, styrenes, and boronic acids has been developed. Key steps of this protocol involve catalytic generation of an iminyl radical from a redox‐active oxime ester and subsequent C−C bond cleavage to generate a cyanoalkyl radical. Upon its addition to styrene, the newly formed benzylic radical undergoes coupling with a boronic‐acid‐derived
Photocatalytic, Phosphoranyl Radical-Mediated N–O Cleavage of Strained Cycloketone Oximes
作者:Peng-Ju Xia、Zhi-Peng Ye、Yuan-Zhuo Hu、Dan Song、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.orglett.9b00651
日期:2019.4.19
A photoinduced, phosphoranyl radical-mediated protocol for the direct N–O cleavage of strained cycloketone oximes via a polar/SET crossover process was developed for the first time. This visible-light-driven direct N–O activation mode for oxime offers beneficial features such as streamlined synthetic process and versatile photochemical reactivities. Consequently, the alkenes and α-trifluoromethyl alkenes
Cooperative Palladium/Lewis Acid-Catalyzed Transfer Hydrocyanation of Alkenes and Alkynes Using 1-Methylcyclohexa-2,5-diene-1-carbonitrile
作者:Anup Bhunia、Klaus Bergander、Armido Studer
DOI:10.1021/jacs.8b10651
日期:2018.11.28
represents a clean and safe alternative to hydrocyanation processes using toxic HCN gas. Such reactions provide access to pharmaceutically important nitrile derivatives starting with alkenes and alkynes. Herein, an efficient and practical cooperative palladium/Lewis acid-catalyzed transfer hydrocyanation of alkenes and alkynes is presented using 1-methylcyclohexa-2,5-diene-1-carbonitrile as a benign and readily
Electro-reductive C-H cyanoalkylation of quinoxalin-2(1H)-ones
作者:Ling Ding、Kaikai Niu、Yuxiu Liu、Qingmin Wang
DOI:10.1016/j.cclet.2021.12.053
日期:2022.8
we report a practical electro-reductive protocol for the direct C–H cyanoalkylation of quinoxalin-2(1H)-ones via iminyl radical-mediated ring opening. These mild reactions proceed under metal-, reductant-, and reagent-free conditions to provide synthetically useful cyanoalkylated quinoxalin-2(1H)-ones.
在此,我们报告了一种实用的电还原方案,用于通过亚氨基自由基介导的开环对 quinoxalin-2(1 H )-酮进行直接 C-H 氰烷基化。这些温和的反应在无金属、无还原剂和无试剂条件下进行,以提供合成有用的氰基烷基化喹喔啉-2(1 H )-酮。
Photoredox/Ti Dual‐Catalyzed Dehydroxylation of Cyclobutanone Oximes for γ‐Cyanoalkyl Radical Generation: Access to Cyanoalkyl‐Substituted Oxoindolines
In this work, we have established a photoredox/Ti dual-catalyzed dehydroxylation of cyclobutanoneoximes. The resulting γ-cyanoalkyl radicals undergo a cascade radical addition/cyclization with N-acrylamides to afford cyanoalkylsubstitutedoxoindolines under mild conditions. This reaction also exhibits broad substrate scope and good functional group tolerance. Furthermore, it is applicable to late-stage