开发用于环境友好的有机转化的催化剂是一个非常活跃的研究领域。迄今为止报道的大多数催化剂都是基于过渡金属配合物。近年来,已经报道了由主族金属化合物催化的例子。在此,我们报告了一系列镁钳配合物,并通过 NMR 和 X 射线单晶衍射对其进行了表征。研究了通过芳构化/脱芳构化金属-配体合作对 H 2的可逆活化。利用所获得的配合物,在无碱条件下证明了前所未有的均相主族金属催化炔烃的半氢化和烯烃的氢化,得到Z-烯烃和烷烃分别作为产物,具有优异的收率和选择性。对照实验和 DFT 研究揭示了金属-配体合作参与氢化反应。该研究不仅为镁催化的炔烃半加氢和烯烃加氢提供了新途径,而且为主族金属配合物催化的其他化合物加氢提供了机会。
Palladium-Catalyzed Decarboxylative<i>sp</i>-<i>sp</i><sup>2</sup>Cross-Coupling Reactions of Aryl and Vinyl Halides and Triflates with α,β-Ynoic Acids using Silver Oxide
作者:Hyunseok Kim、Phil Ho Lee
DOI:10.1002/adsc.200900502
日期:2009.11
Palladium-catalyzed decarboxylative sp-sp2 cross-couplingreactions of aryl and vinyl halides and triflates with α,β-ynoic acids using silver oxide have been developed. A variety of α,β-ynoic acids were readily decarboxylated in the presence of silver oxide and then, generated in situ, silver acetylides were coupled with electrophiles in the presence of a palladium(0) catalyst under neutral conditions
Synthesis of trisubstituted alkenes by Ni-catalyzed hydroalkylation of internal alkynes with cycloketone oxime esters
作者:Xiao-Yu Lu、Chuang-Chuang Liu、Run-Chuang Jiang、Lu-Yu Yan、Qi-Le liu、Qing-Qing Wang、Jia-Mei Li
DOI:10.1039/d0cc06517j
日期:——
Ni-catalyzed hydroalkylation of internal alkynes with cycloketone oxime esters was developed. The reaction has a broad substrate scope. This hydroalkylation shows excellent regio- and stereo-selectivity. This method enables readily available starting materials to be used to access a range of cyano-substituted single-configuration trisubstituted alkenes. These are valuable feedstock chemicals and are widely
Copper‐catalyzed Sonogashira‐type reactions were dramatically accelerated by introducing a catalytic amount of polycyclicaromatichydrocarbon additive. This novel catalytic system features low copper loading (0.5 mol% < Cu < 5 mol%), broad reaction scope and remarkable substrate tolerance. Both aromatic and aliphatic terminal alkynes as well as diverse aryl iodides were employed in this transformation
Facile Synthesis of Substituted Alkynes by Cyclopalladated Ferrocenylimine Catalyzed Cross-Coupling of Arylboronic Acids/Esters with Terminal Alkynes
作者:Fan Yang、Yangjie Wu
DOI:10.1002/ejoc.200700065
日期:2007.7
A highly efficient and convenient catalytic system for the cross-coupling reaction of arylboronic reagents with terminalalkynes was described by using cyclopalladated ferrocenylimine (I)/silver oxide as the catalyst at room temperature. This method provides the first examples of a palladacycle-catalyzed cross-coupling reaction of arylboronic acids/esters with terminalalkynes under mild conditions