Gold-catalyzed cycloisomerization of [3]-cumulenols
作者:Laura Ferrand、Nicolas Das Neves、Max Malacria、Virginie Mouriès-Mansuy、Cyril Ollivier、Louis Fensterbank
DOI:10.1016/j.jorganchem.2015.02.003
日期:2015.10
The gold-catalyzedcycloisomerization of tetrasubstituted [3]-cumulenols has been investigated. Overall, two main pathways are followed. In the presence of gold(III) catalysts, a dehydration process prevails giving diastereomerically pure dienynes while gold(I) catalysts favor the cycloisomerization to provide trisubstituted furan derivatives.
Gold and Brønsted acid catalyzed isomerization of [3]cumulenols and [3]cumulenones: efficient syntheses of 1,5-dien-3-ynes and furan derivatives
作者:Erjuan Wang、Xiaoping Fu、Xin Xie、Jingjin Chen、Hongjun Gao、Yuanhong Liu
DOI:10.1016/j.tetlet.2011.02.057
日期:2011.4
On the other hand, cycloisomerizations of the corresponding [3]cumulenones catalyzed by gold(I) complexes afford vinyl furans through activation of the cumulenic double bond via a π-complex, and during the process, deprotonation from an alkyl group on cumulene terminus takes place to induce the isomerization.