Regioselective and Redox‐Neutral Cp*Ir
<sup>III</sup>
‐Catalyzed Allylic C−H Alkynylation
作者:Shobhan Mondal、Tobias Pinkert、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.202015249
日期:2021.3.8
bromoalkynes via intermolecular allylicC−Halkynylation. The developed mild reaction conditions tolerate a broad range of common functional groups, even enabling selective alkynylation of allylicC−H bonds in the presence of other prominent directing groups. Mechanistic experiments including the isolation of a catalytically active IrIII‐allyl species support an intermolecular allylicC−H activation followed by
在本文中,我们报道了Cp * Ir III催化的高度区域选择性和氧化还原中性方案,用于通过分子间烯丙基CH-H烷基化反应从未活化的烯烃和溴炔烃构建1,4-烯炔。发达的温和反应条件可以耐受广泛的通用官能团,甚至可以在存在其他重要的导向基团的情况下选择性烯丙基CH键进行炔基化反应。包括分离具有催化活性的Ir III-烯丙基物种的机械实验支持分子间烯丙基CH活化,然后进行亲电炔基化。
Regio- and stereoselective synthesis of 1,4-enynes by iron-catalysed Suzuki–Miyaura coupling of propargyl electrophiles under ligand-free conditions
The first iron-catalysed cross coupling of propargyl electrophiles with lithium alkenylborates has been developed. Various propargyl electrophiles can be cross-coupled with lithium (E)- or (Z)-alkenylborates in a stereospecific manner to afford the corresponding 1,4-enynes in good to excellent yields. The reaction features high SN2-type regioselectivity and functional group compatibility.
A Pd(0)-Catalyzed Direct Dehydrative Coupling of Terminal Alkynes with Allylic Alcohols To Access 1,4-Enynes
作者:Yang-Xiong Li、Qing-Qing Xuan、Li Liu、Dong Wang、Yong-Jun Chen、Chao-Jun Li
DOI:10.1021/ja406025p
日期:2013.8.28
A direct dehydrative coupling of terminal alkynes with allylic alcohols catalyzed by Pd(PPh3)(4) with an N,P-ligand assisted by Ti(OiPr)(4) has been developed. The coupling reaction tolerates various functional groups, providing a valuable synthetic tool to access 1,4-enynes.