Sulfoxide-Controlled S<sub>N</sub>2‘ Displacements between Cyanocuprates and Epoxy Vinyl Sulfoxides<sup>1</sup>
作者:Joseph P. Marino、Laura J. Anna、Roberto Fernández de la Pradilla、María Victoria Martínez、Carlos Montero、Alma Viso
DOI:10.1021/jo000468k
日期:2000.10.1
Two short and convergent routes have been devised for the preparation of enantiomerically pure acyclic epoxy vinyl sulfoxides. These substrates undergo highly regio- and stereoselective S(N)2' displacements with lithium cyanocuprates to give alpha'-alkylated, gamma-oxygenated Z alpha,beta-unsaturated sulfoxides in moderate to good yields and with good to excellent diastereoselectivities. The absolute
为了制备对映体纯的无环环氧乙烯基亚砜,设计了两种短而收敛的途径。这些底物与氰基癸酸锂发生高度区域选择性和立体选择性S(N)2'置换,以中等至良好的产率并具有良好至优异的非对映选择性,产生α'-烷基化,γ-加氧的Zα,β-不饱和亚砜。新形成的碳-碳键的绝对构型主要由手性硫原子控制,该手性硫原子在非增强状态下可以取代乙烯基环氧乙烷部分的固有反趋势,并迫使铜酸盐进行顺式加成。所得加合物的羟基乙烯基亚砜官能度应允许随后的不对称转化,从而增强该方法的合成实用性。