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.
通过TsOH·H 2 O催化TMS取代的[3]枯烯醇的脱水反应,获得了一种具有高立体选择性的组装π共轭二烯的方法。I)配合物通过经由π-配合物的枯烯双键的活化而提供乙烯基呋喃,并且在该过程中,发生了从异丙苯终端上的烷基的去质子化以诱导异构化。