Synthesis of Isomerically Pure (<i>Z</i>)-Alkenes from Terminal Alkynes and Terminal Alkenes: Silver-Catalyzed Hydroalkylation of Alkynes
作者:Mitchell T. Lee、Madison B. Goodstein、Gojko Lalic
DOI:10.1021/jacs.9b09336
日期:2019.10.30
molecules and often are used as intermediates in organic synthesis. Many alkenes exist in two stereoisomeric forms (E and Z), which have different structures and different properties. The selective formation of the two isomers is an important synthetic goal that has long inspired the development of new synthetic methods. However, the efficient synthesis of diastereopure, thermodynamically less stable, Z-alkenes
Stereospecific Synthesis of <i>E</i>-Alkenes through Anti-Markovnikov Hydroalkylation of Terminal Alkynes
作者:Avijit Hazra、Jason Chen、Gojko Lalic
DOI:10.1021/jacs.9b04800
日期:2019.8.14
We have developed a method for stereospecificsynthesis of E-alkenes from terminal alkynes and alkyl iodides. The hydroalkylation reaction is enabled by a cooperative action of copper and nickel catalysts and proceeds with excellent anti-Markovnikov selectivity. We demonstrate the broad scope of the reaction, which can be accomplished in the presence of esters, nitriles, aryl bromides, ethers, alkyl
Photoinduced Copper‐Catalyzed Coupling of Terminal Alkynes and Alkyl Iodides
作者:Avijit Hazra、Mitchell T. Lee、Justin F. Chiu、Gojko Lalic
DOI:10.1002/anie.201801085
日期:2018.5.4
We have developed a photoinduced copper‐catalyzed alkylation of terminal alkynes with primary, secondary, or tertiary alkyl iodides as electrophiles. The reaction has a broad substrate scope and can be successfully performed in the presence of ester, nitrile, aryl halide, ketone, sulfonamide, epoxide, alcohol, and amide functional groups. The alkylation is promoted by blue light (λ≈450 nm) and proceeds
Catalytic Anti-Markovnikov Hydroallylation of Terminal and Functionalized Internal Alkynes: Synthesis of Skipped Dienes and Trisubstituted Alkenes
作者:Melrose Mailig、Avijit Hazra、Megan K. Armstrong、Gojko Lalic
DOI:10.1021/jacs.7b02104
日期:2017.5.24
and functionalized internal alkynes. In this article, we describe the development of the reaction, exploration of the substrate scope, and a study of the reaction mechanism. Synthesis of skipped dienes through the hydroallylation of terminal alkyl and aryl alkynes with simple allyl phosphates and 2-substituted allyl phosphates is described. The hydroallylation of functionalized internal alkynes leads
Hydroalkylation of Alkynes: Functionalization of the Alkenyl Copper Intermediate through Single Electron Transfer Chemistry
作者:Avijit Hazra、Jonathan A. Kephart、Alexandra Velian、Gojko Lalic
DOI:10.1021/jacs.1c03396
日期:2021.6.2
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,
我们开发了一种末端炔烃和α-溴羰基立体选择性偶联生成官能化E-烯烃的方法。偶联是通过将炔烃的闭壳氢化铜化与所得烯基铜中间体的开壳单电子转移 (SET) 化学相结合来实现的。我们证明该反应与各种官能团相容,并且可以在芳基溴、烷基氯、烷基溴、酯、腈、酰胺和多种含氮杂环化合物的存在下进行。机理研究为通过 α-溴酯对烯基铜中间体进行 SET 氧化提供了证据,这是实现交叉偶联的关键步骤。