Palladium-Catalyzed Aerobic Oxidative Cross-Coupling Reactions of Terminal Alkynes with Alkylzinc Reagents
作者:Mao Chen、Xiaolong Zheng、Wenqing Li、Jun He、Aiwen Lei
DOI:10.1021/ja100630p
日期:2010.3.31
With air as the oxidant, terminalalkynes can be directly cross-coupled with alkylzinc reagents in the presence of a Pd catalyst at room temperature. CO was found to be critical in gaining high chemical yields and selectivities. A wide range of alkynes and alkylzinc reagents were tested, and good to excellent yields were obtained.
以空气为氧化剂,在室温下,在钯催化剂的存在下,末端炔烃可以与烷基锌试剂直接交叉偶联。发现 CO 对于获得高化学产率和选择性至关重要。测试了范围广泛的炔烃和烷基锌试剂,并获得了良好的收率。
A novel bond formation through oxidative cross-coupling with desyl chloride as the oxidant has been investigated. The coupling can be carried out under mild conditions. The Csp3-center carbon was involved even in the presence of a β-H, and up to 90% of the desired cross-coupling product was obtained with the secondary Csp3-center substrate.
Cross-coupling reactions between some allyl, homoallyl, and homopropargyl substrates and trialkylalanes or dialkyl- and diaryl-magnesium derivatives *
作者:G.A. Tolstikov、U.M. Dzhemilev
DOI:10.1016/0022-328x(85)87328-9
日期:1985.9
Trialkylalanes and dialkyl- and diaryl-magnesium derivatives can be cross-coupled with allyl ethers and esters, sulphides, and quaternized allylamines. The reactions proceed uncatalyzed either with mild conditions or in the presence of copper complex catalysts to result in high yields of mono- and di-olefins of various structures.
Oxidative Cross-Coupling through Double Transmetallation: Surprisingly High Selectivity for Palladium-Catalyzed Cross-Coupling of Alkylzinc and Alkynylstannanes
Two different organometallic reagents now can cross-couple together with the oxidative cross-coupling strategy. Palladium catalyzed oxidative cross-couplings of alkylzinc and alkynylstannane reagents using desyl chloride as the oxidant have been explored, which produce the desired Csp-Csp3 cross-coupling product in surprisingly high selectivity and yields. The current catalytic system tolerates the presence of beta-H, and the reactions using long chain alkyl zinc reagents gave the cross-coupling product in excellent yields and selectivities.
Electrophile induced rearrangement of 1-alkynylaluminium ate complexes
The title species have been shown to rearrange under the influence of the electrophile PhSCl to give tetrasubstituted vinylaluminium compounds protonolysis of which led to the corresponding vinyl sulfides in a highly stereoselective manner. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.