Nickel-Catalyzed, Carbonyl-Ene-Type Reactions: Selective for Alpha Olefins and More Efficient with Electron-Rich Aldehydes
作者:Chun-Yu Ho、Sze-Sze Ng、Timothy F. Jamison
DOI:10.1021/ja061471+
日期:2006.4.1
carbonyl-ene-type reactions, including those between alpha olefins and aromatic aldehydes. Catalyzed by nickel, these processes complement existing Lewis acid-catalyzed methods in several respects. Not only are monosubstituted alkenes, aromatic aldehydes, and tert-alkyl aldehydes effective substrates, but monosubstituted olefins also react faster than those that are more substituted, and large or electron-rich
Rational Design of a Second Generation Catalyst for Preparation of Allylsilanes Using the Silyl-Heck Reaction
作者:Jesse R. McAtee、Glenn P. A. Yap、Donald A. Watson
DOI:10.1021/ja505446y
日期:2014.7.16
second-generation ligand, bis(3,5-di-tert-butylphenyl)(tert-butyl)phosphine, for the preparation of allylsilanes using the palladium-catalyzed silyl-Heck reaction. This new ligand provides nearly complete suppression of starting material alkene isomerization that was observed with our first-generation catalyst, providing vastly improved yields of allylsilanes from simple alkene starting materials.
使用合理的配体设计,我们开发了第二代配体,双(3,5-二叔丁基苯基)(叔丁基)膦,用于使用钯催化的甲硅烷基-Heck 反应制备烯丙基硅烷。这种新的配体几乎完全抑制了我们的第一代催化剂所观察到的原料烯烃异构化,大大提高了从简单烯烃原料中获得的烯丙基硅烷的产率。描述了量化新配体的电子和空间特性的研究。最后,我们报告了使用类似配体氧化加成 Me3SiI 产生的钯络合物的 X 射线晶体结构,该结构提供了对催化系统性质的重要洞察。
Nickel-Catalyzed Coupling of Alkenes, Aldehydes, and Silyl Triflates
作者:Sze-Sze Ng、Chun-Yu Ho、Timothy F. Jamison
DOI:10.1021/ja062866w
日期:2006.9.1
two recently developed nickel-catalyzed coupling reactions of alkenes, aldehydes, and silyl triflates is presented. These reactions provide either allylic alcohol or homoallylic alcohol derivatives selectively, depending on the ligand employed. These processes are believed to be mechanistically distinct from Lewisacid-catalyzed carbonyl-ene reactions, and several lines of evidence supporting this hypothesis