Catalytic Anti-Markovnikov Hydrobromination of Alkynes
作者:Mycah R. Uehling、Richard P. Rucker、Gojko Lalic
DOI:10.1021/ja503944n
日期:2014.6.18
We have developed the first catalytic method for anti-Markovnikovhydrobromination of alkynes. The reaction affords terminal E-alkenyl bromides in high yield and with excellent regio- and diastereoselectivity. Both aryl- and alkyl-substituted terminal alkynes can be used as substrates. Furthermore, the reaction conditions are compatible with a wide range of functional groups, including esters, nitriles
<scp>Copper‐Catalyzed</scp>
1,2,
<scp>5‐Trifunctionalization</scp>
of Terminal Alkynes Using
<scp>SR</scp>
as a Transient Directing Group for Radical Translocation
作者:Jian Feng、Fang Zhang、Chenyun Shu、Gangguo Zhu
DOI:10.1002/cjoc.202200092
日期:2022.7.15
The first Cu-catalyzed 1,2,5-trifunctionalization of abundant terminalalkynes is realized by merging hydrogen atom transfer and traceless directing strategy with SR as a transientgroup, delivering highly functionalized aldehydes in moderate to excellent yields with broad substrate scope. The synthetic utility of this method was demonstrated by the gram-scale reaction and downstream transformations
通过将氢原子转移和无痕导向策略与 SR 作为瞬态基团相结合,实现了第一次 Cu 催化的丰富末端炔烃的 1,2,5-三官能化,以中等至优异的产率提供高度官能化的醛,具有广泛的底物范围。该方法的合成效用通过克级反应和所得产物的下游转化得到证明。鉴于在单个反应中高效安装三种不同的官能团,它可以作为一种非常有吸引力的方法,用于从容易获得的起始材料快速组装复杂分子。