Enantioselective Synthesis of Quaternary Carbon Stereocenters: Addition of 3-Substituted Oxindoles to Vinyl Sulfone Catalyzed by Pentanidiums
作者:Lili Zong、Shubo Du、Kek Foo Chin、Chao Wang、Choon-Hong Tan
DOI:10.1002/anie.201503844
日期:2015.8.3
3‐alkyloxindoles to phenyl vinyl sulfone has been demonstrated. This approach allows the construction of 3,3‐dialkyl‐substituted oxindole frameworks with high yield and excellent enantioselectivity (up to 99 %) under simple phase‐transfer conditions. A variety of oxindoles bearing all‐carbon quaternary stereogenic centers were obtained in the presence of 0.25 mol % pentanidium. Meanwhile, practicality was
证明了戊烷催化的3-烷基氧吲哚向苯乙烯基砜的高对映选择性共轭加成反应。这种方法允许在简单的相转移条件下以高收率和出色的对映选择性(高达99%)构建3,3-二烷基取代的羟吲哚骨架。在0.25摩尔%的戊ani存在下,获得了各种带有全碳四元立体异构中心的羟吲哚。同时,通过两个3,3-二烷基取代的羟吲哚的克级不对称合成说明了实用性。生成的加合物可以通过短合成路线顺利转化为天然产物类似物。