Hydroalkylation of Alkynes: Functionalization of the Alkenyl Copper Intermediate through Single Electron Transfer Chemistry.

Hydroalkylation of Alkynes: Functionalization of the Alkenyl Copper Intermediate through Single Electron Transfer Chemistry.
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DOI:
10.1021/jacs.1c03396
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发表时间:
2021-06-02
影响因子:
15
通讯作者:
Lalic G
Lalic G
中科院分区:
化学1区
文献类型:
--
作者:
Hazra A;Kephart JA;Velian A;Lalic G

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我们发展了一种由末端炔和α-溴代羰基化合物立体选择性偶联生成功能化E-烯烃的方法。通过将炔的闭壳氢铜化与所得烯基铜中间体的开壳单电子转移(SET)化学合并来实现耦合。我们证明,该反应是兼容的各种官能团,并可以在芳基溴,烷基氯,烷基溴,酯,腈,酰胺,和广泛的含氮杂环化合物的存在下进行。机理研究提供了证据证明,通过α -溴代酯对烯基铜中间体的SET氧化是实现交叉偶联的关键步骤。
We have developed a method for the stereoselective coupling of terminal alkynes and α-bromo carbonyls to generate functionalized E-alkenes. The coupling is accomplished by merging the closed-shell hydrocupration of alkynes with the open-shell single electron transfer (SET) chemistry of the resulting alkenyl copper intermediate. We demonstrate that the reaction is compatible with various functional groups and can be performed in the presence of aryl bromides, alkyl chlorides, alkyl bromides, esters, nitriles, amides, and a wide range of nitrogen-containing heterocyclic compounds. Mechanistic studies provide evidence for SET oxidation of the alkenyl copper intermediate by an α -bromo ester as the key step that enables the cross coupling.
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