Selectivities in Nickel-Catalyzed Hydrocarboxylation of Enynes with Carbon Dioxide
作者:Tao Cao、Zheng Yang、Shengming Ma
DOI:10.1021/acscatal.7b00556
日期:2017.7.7
A three-component hydrocarboxylation of enynes with ZnEt2 and CO2 is realized. Highly selective cyclizative carboxylation of the C–C triple bond was observed. Preliminary mechanistic studies indicated both the concerted cyclometalation mechanism and the stepwise C═C bond-directed carboxylation were possible in this reaction.
Nickel-mediated carboxylative cyclization of enynes
作者:Masanori Takimoto、Takashi Mizuno、Yoshihiro Sato、Miwako Mori
DOI:10.1016/j.tetlet.2005.05.129
日期:2005.8
Nickel-mediated carboxylative cyclization of alpha,omega-enyne using carbon dioxide was investigated. Oxidative cycloaddition of enynes having an electron withdrawing group on alkene to a zero-valent nickel complex smoothly proceeded to provide nickelacyclopentene intermediates, which regioselectively reacted with CO2 at the Csp(3)-nickel bond, giving cyclized carboxylation products in good yields. (c) 2005 Elsevier Ltd. All rights reserved.