Palladium-catalysed vinylation of organic halides under solid–liquid phase transfer conditions
作者:Tuyet Jeffery
DOI:10.1039/c39840001287
日期:——
Heck-type reactions involving organichalides proceed readily at or near room temperature when performed undersolid–liquidphasetransferconditions.
当在固液相转移条件下进行时,涉及有机卤化物的Heck型反应很容易在室温下或接近室温下进行。
Oxidative Palladium(II) Catalysis: A Highly Efficient and Chemoselective Cross-Coupling Method for Carbon−Carbon Bond Formation under Base-Free and Nitrogenous-Ligand Conditions
作者:Kyung Soo Yoo、Cheol Hwan Yoon、Kyung Woon Jung
DOI:10.1021/ja063710z
日期:2006.12.1
For instance, oxidativepalladium(II) catalysis is effective with highly substituted alkenes and cyclic alkenes, which are known to be incompatible with other known catalytic conditions. Most examined reactions progressed smoothly to completion at low temperatures and in short times. These interesting results provide mechanistic insights and utilities for a new paradigm of palladium catalytic cycles
我们在此报告了氧促进 Pd(II) 催化的通用和温和协议的开发,导致烯基和芳基硼化合物与各种烯烃的选择性交叉偶联。与大多数交叉偶联反应不同,这种新方法即使在没有碱基的情况下也能很好地工作,因此避免了不需要的同源偶联。包括二甲基菲咯啉在内的基于氮的配体增强了反应性,并提供了一种高效的立体选择性方法来克服具有挑战性的底物限制。例如,氧化钯 (II) 催化对于高度取代的烯烃和环烯烃是有效的,已知它们与其他已知的催化条件不相容。大多数检查的反应在低温和短时间内顺利完成。
On the Mechanism of Cu-Catalyzed Enantioselective Extended Conjugate Additions: A Structure-Based Approach
作者:Tim den Hartog、Yange Huang、Martín Fañanás-Mastral、Anne Meuwese、Alena Rudolph、Manuel Pérez、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/cs501297s
日期:2015.2.6
The enantioselective 1,6-addition to unsaturated carbonylcompounds offers unique opportunities to study the range of selectivities one can obtain using Cu catalysis. Here, a substrate–reagent approach to obtain structural information on the mechanism of extended conjugateadditions is reported. By studying the influence of several halides in the Grignard reagent and in the Cu source on the enantioselective
Treatment of furfuryl phenyl selenides with butyllithium or metallic lithium induces the facileringopening reaction of their furan ring and the corresponding dienones are obtained in high yields.
用丁基锂或金属锂处理糠基苯基硒化物可引发呋喃环的易开环反应,并以高收率获得相应的二烯酮。
Polymeric tertiaryphosphine as a green and recyclable organocatalyst for stereoselective isomerization reaction
作者:Yugang Wang、Huanfeng Jiang、Hailing Liu、Peng Liu
DOI:10.1016/j.tetlet.2005.03.198
日期:2005.5
A green, simple and effective polymeric organocatalytic system, polymer-supported triphenylphosphine (PS-TPP), for the stereoselective isomerization of α,β-ynones to (E,E)-α,β-γ,δ-dienones is reported here. The catalyst, PS-TPP could be recovered by simple filtration and reused several times with high activity.