Oxygen-Promoted Palladium(II) Catalysis: Facile C(sp2)−C(sp2) Bond Formation via Cross-Coupling of Alkenylboronic Compounds and Olefins
摘要:
Oxygen-promoted Pd(II) catalysis facilitated the synthesis of conjugated dienes; by cross-coupling of alkenylboronic compounds and various olefins including highly substituted alkenes and cyclohexenone. Under mild conditions, these versatile reactions were efficient and highly stereoselective.
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。
Cobalt(I)-Catalyzed StereoselectiveOlefination of Alkylzinc Reagents with Aldehydes
作者:Jin-Xian Wang、Ying Fu、Yulai Hu、Kehu Wang
DOI:10.1055/s-2003-40509
日期:——
The efficient olefination from organozinc reagents with aldehydes is exploited in a new synthesis of aryl and alkyl olefins.
Base-dependent formation of cis and trans olefins and their application in the synthesis of 5-oxo-ETE receptor antagonists
作者:Vivek Gore、Shishir Chourey、Qiuji Ye、Pranav Patel、Yannick Ouedraogo、Sylvie Gravel、William S. Powell、Joshua Rokach
DOI:10.1016/j.bmcl.2014.05.090
日期:2014.8
receptor antagonists. In the course of the work, we have developed a procedure to selectively introduce a cis and trans double bond in an alkyl side chain. Reacting indolecarboxaldehydes with alkyl ylides using the Li base affords the transolefins, whereas using the K base yields the cisolefins.
The palladium-catalyzed “head-to-tail” cross-coupling reaction of 1-alkenylboranes with phenyl or 1-alkenyl iodides. A novel synthesis of 2-phenyl-1-alkenes or 2-alkyl-1,3-alkadienes via organoboranes
作者:Norio Miyaura、Akira Suzuki
DOI:10.1016/s0022-328x(00)82970-8
日期:1981.6
The reaction of phenyl or 1-alkenyl iodides with 1-alkenyl-1,3,2-benzodioxaboroles readily obtainable via the hydroboration of 1-alkynes, gives the corresponding “head-to-tail” cross-coupling products, 2-phenyl-1-alkenes or 2-alkyl-1,3-alkadienes, in good yields. The reaction is effectively catalyzed by catalytic amounts of palladium compounds in the presence of triethylamine.
A synthesis of conjugated dienes from aromatic, five-membered heterocycles
作者:Ernest Wenkert、Michael H. Leftin、Enrique L. Michelotti
DOI:10.1039/c39840000617
日期:——
Reaction of furan, thiophene, selenophene, and tellurophene as well as 2-methyl and 2,5-dimethyl derivatives of the first two heterocycles with phenyl-, methyl-, and n-butyl-magnesium bromides in the presence of ligated nickel dichloride are shown to yield buta-1,3-dienes mostly with retention of configuration.