Enantioselective Construction of Tetrahydroquinolin-5-one-Based Spirooxindole Scaffold via an Organocatalytic Asymmetric Multicomponent [3 + 3] Cyclization
作者:Qiu-Ning Zhu、Yu-Chen Zhang、Meng-Meng Xu、Xiao-Xue Sun、Xue Yang、Feng Shi
DOI:10.1021/acs.joc.6b01598
日期:2016.9.2
e-based spirooxindole has been developed via a chiral cinchona alkaloid catalyzed asymmetric three-component [3 + 3] cyclization of cyclic enaminone, isatin, and malononitrile, which afforded a series of tetrahydroquinolin-5-one-based spirooxindoles in high yields and with excellent enantioselectivities (up to 99% yield, 97:3 er). This reaction could be applicable to large-scale synthesis of enantioenriched
通过手性金鸡纳生物碱催化环状烯胺酮,靛红和丙二腈的不对称三组分[3 + 3]环化反应,开发了具有生物重要性的基于四氢喹啉-5-酮的第一个催化对映选择性结构,得到了一系列四氢喹啉基于-5-one的spirooxindoles,具有高收率和出色的对映选择性(高达99%的收率,97:3 er)。该反应可用于大规模合成对映体富集的基于四氢喹啉-5-一的螺环辛多酯。这种合成方法不仅为构建基于手性四氢喹啉-5-酮的螺氧杂吲哚支架提供了独特的方法,而且还增加了我们对催化对映选择性多组分反应的理解。