We report the metal-free chalcogenation of cycloketone oxime esters with dichalcogenides via a radical process. Because of the metal-free condition and use of readily accessible dichalcogenides, this method is an effective and green strategy for the synthesis of chalcogen-substituted butyronitrile.
Photoinduced C-C Bond Cleavage and Oxidation of Cycloketoxime Esters
作者:Binlin Zhao、Hui Tan、Cheng Chen、Ning Jiao、Zhuangzhi Shi
DOI:10.1002/cjoc.201800206
日期:2018.11
the traditional Beckmann rearrangement process has been established to build cyano‐containing ketones in the presence of photocatalyst. This novel transformation is remarkable with selective C—Cbondcleavage and an oxidation process enabled by DMSO used as the solvent, oxidant, and oxygen source avoiding acid, base and toxic cyanide salts as the cyano source. Further applications in late‐stage modification
Catalyticenantioselective chemical reactions involving highly reactive radical species remain largely unexplored. We report herein for the first time a novel enantioselective radical ring-opening cyanation of redox-active oxime esters by dual photoreodox and copper catalysis. This mild protocol shows good functional group tolerance and broad substrate scope, producing a wide range of optically active
A visible-light-induced radical cascade cyclization of aryl isonitriles and cyclobutanone oxime esters for the synthesis of cyclopenta[b]quinoxalines has been accomplished for the first time. The key to the success of this process was the integration of the in situ-formed nitrile radical followed by the cascade radical isonitrile/nitrile insertion-cyclization. The easy introduction of substituents
首次实现了可见光诱导的芳基异腈和环丁酮肟酯的自由基级联环化反应,用于合成环戊[ b ]喹喔啉。该方法成功的关键是原位形成的腈自由基的整合,然后是级联自由基的腈/腈插入-环化反应。容易为两种底物引入取代基以及反应的高官能团耐受性使其成为以中等至良好收率得到各种喹喔啉衍生物的有效策略。
Visible-Light Photoredox-Catalyzed Dicarbofunctionalization of Styrenes with Oxime Esters and CO<sub>2</sub>: Multicomponent Reactions toward Cyanocarboxylic Acids and γ-Keto Acids
作者:Junxue Bai、Miao Li、Cong Zhou、Yu Sha、Jiang Cheng、Jianwei Sun、Song Sun
DOI:10.1021/acs.orglett.1c03938
日期:2021.12.17
photoredox-catalyzed dicarbofunctionalization of styrenes with oximeesters and CO2 has been achieved. Notably, a series of four-, five-, or six-membered cyclic ketone oximes worked well to furnish a wide range of ε-, ζ-, and η-cyanocarboxylic acids in good yields. Furthermore, a series of γ-keto acids also could be obtained by employing acyclic ketone oximeesters as the carbonyl radical precursor. It provides convergent
已经实现了苯乙烯与肟酯和 CO 2的光氧化还原催化双碳官能化。值得注意的是,一系列四元、五元或六元环酮肟可以很好地以良好的产率提供各种 ε-、ζ- 和 η-氰基羧酸。此外,以无环酮肟酯为羰基自由基前驱体,还可以得到一系列γ-酮酸。它提供了对多种生物学上重要的氰基羧酸和 γ-酮酸的聚合访问。