Catalytic Enantioselective Alkylation of Aldehydes with 3-Bromooxindoles
作者:Zhen Li、Xiao-Ming Zhang、Fu-Min Zhang、Yong-Qiang Tu
DOI:10.1021/acs.orglett.3c02882
日期:2023.10.6
An asymmetric conjugate addition of aldehydes with o-azaxylylene intermediates (indol-2-ones) from 3-bromooxindoles has been developed. The use of a novel spiro-pyrrolidine (SPD)-derived bifunctional N-sulfonylated amide catalyst is essential for a highly diastereo- and enantioselective transformation to provide a wide array of enantioenriched C3 quaternary oxindoles with structurally diverse β-aldehyde
已经开发出醛与来自 3-溴氧吲哚的邻氮杂二甲苯中间体(吲哚-2-酮)的不对称共轭加成。使用新型螺吡咯烷 (SPD) 衍生的双功能N-磺酰化酰胺催化剂对于高度非对映和对映选择性转化至关重要,以提供各种对映体富集的 C3 季羟吲哚,并具有结构多样的 β-醛附属物。这种合成方法的进一步应用使得能够构建 akuammiline 型生物碱的三环核心。
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