Electrosynthesis of
<i>ortho</i>
‐Amino Aryl Ketones by Aerobic Electrooxidative Cleavage of the C(2)=C(3)/C(2)−N Bonds of
<i>N</i>
‐Boc Indoles
作者:Jintao Wu、Zehui Peng、Tong Shen、Zhong‐Quan Liu
DOI:10.1002/adsc.202200256
日期:2022.8.2
strategies for oxidativecleavage of 2,3-double bond of substituted indoles generally suffered from usage of heavy metals, stoichiometric chemical oxidants or hash conditions. Herein, we reported an electrochemistry-driven aerobiccleavage of C(2)=C(3)/C(2)−N bonds of indoles. Through an undivided cell, various indoles and its derivatives can be converted into the corresponding ortho-amino aryl ketones. This
A palladium-catalyzed asymmetric hydrogenation of unprotected 3-substituted indoles was developed, providing a series of 3-substituted indolines in excellent yields with ≤94.4:5.6 er. The large sterically hindered bisphosphine ligand played a crucial role in the enantioselective control. In addition, the gram-scale hydrogenation experiment and product derivatizations were performed successfully.
开发了一种钯催化的未保护的 3-取代吲哚的不对称氢化,以 ≤94.4:5.6 er 的优异收率提供了一系列 3-取代二氢吲哚。大的空间位阻双膦配体在对映选择性控制中起着至关重要的作用。此外,成功地进行了克级加氢实验和产品衍生化。
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。