Stereoselective Synthesis of Exocyclic Alkenes by Cu-Catalyzed Allylmagnesiation, Pd-Catalyzed Alkylation, and Ru-Catalyzed Ring-Closing Metathesis: Highly Stereoselective Synthesis of (Z)- and (E)-γ-Bisabolenes
作者:Luigi Anastasia、Yves R. Dumond、Ei-ichi Negishi
DOI:10.1002/1099-0690(200108)2001:16<3039::aid-ejoc3039>3.0.co;2-v
日期:2001.8
Highly efficient stereoselective syntheses of both (Z)- and (E)-γ-bisabolenes (1) were achieved by ring closing metathesis of stereodefined tetrasubstituted alkenes. Both (Z)- and (E)-tetrasubstituted alkene precursors were obtained by Cu-catalyzed stereoselective addition of allylmagnesium bromide to propargyl alcohols, followed by Pd-catalyzed cross coupling of alkylzinc derivatives. This represents
(Z)- 和 (E)-γ-红没药烯 (1) 的高效立体选择性合成是通过立体定义的四取代烯烃的闭环复分解实现的。(Z)-和 (E)-四取代的烯烃前体都是通过 Cu 催化的烯丙基溴化镁与炔丙醇的立体选择性加成,然后是 Pd 催化的烷基锌衍生物的交叉偶联获得的。这代表了闭环复分解在环外烯烃的立体选择性合成中的首次应用。