Asymmetric Synthesis of Remote Quaternary Centers by Copper-Catalyzed Desymmetrization: An Enantioselective Total Synthesis of (+)-Mesembrine
作者:Apparao Bokka、James X. Mao、John Hartung、Steven R. Martinez、Justin A. Simanis、Kwangho Nam、Junha Jeon、Xiaoqiang Shen
DOI:10.1021/acs.orglett.8b02084
日期:2018.9.7
Catalytic asymmetric syntheses of remote quaternary stereocenters have been developed by copper-catalyzed 1,4-hydrosilylation of γ,γ-disubstituted cyclohexadienones. A variety of cyclohexenones have been synthesized in good yield and excellent enantioselectivity. Versatile 2-silyloxy diene intermediates bearing γ,γ-disubstituted all carbon stereogenic centers can be isolated from the mild reaction
通过铜催化γ,γ-二取代的环己二酮的1,4-氢化硅烷化反应,开发了远程四级立体中心的催化不对称合成方法。已经以良好的产率和优异的对映选择性合成了多种环己酮。可以从温和的反应条件中分离出带有γ,γ-二取代的所有碳立构中心的多功能2-甲硅烷基氧二烯中间体。该策略的效用在(+)-半膜的催化不对称全合成中得到了例证。