作者:Masanori Takimoto、Takashi Mizuno、Miwako Mori、Yoshihiro Sato
DOI:10.1016/j.tet.2006.03.121
日期:2006.8
Nickel-mediated carboxylation of α,ω-enyne was investigated. In the presence of a stoichiometric amount of zero-valent nickel complex, enynes having an electron-withdrawing group on alkene reacted with carbon dioxide via intramolecular cyclization to afford cyclic carboxylic acids in good yields. Various heterocyclic compounds were prepared by this carboxylative cyclization protocol. The reaction seems
研究了镍介导的α,ω-烯炔的羧化反应。在化学计量的零价镍络合物的存在下,在烯烃上具有吸电子基团的炔烃通过分子内环化与二氧化碳反应,以高收率得到环状羧酸。通过该羧基化环化方案制备了各种杂环化合物。该反应似乎通过α,ω-烯炔部分的氧化环加成至零价镍络合物,二氧化碳在Csp 3-镍键上的区域选择性插入以及所得氧杂环丙烷环中间体的水解而进行。