Formal Asymmetric Organocatalytic [3+2] Cyclization between Enecarbamates and 3-Indolylmethanols: Rapid Access to 3-Aminocyclopenta[<i>b</i>]indoles
作者:Clément Lebée、Antti O. Kataja、Florent Blanchard、Géraldine Masson
DOI:10.1002/chem.201500749
日期:2015.6.1
A highly enantio‐ and diastereoselective synthesis of 3‐aminocyclopenta[b]indoles has been developed through formal [3+2] cycloaddition reaction of enecarbamates and 3‐indolylmethanols. This transformation is catalyzed by a chiral phosphoric acid that achieves simultaneous activation of both partners of the cycloaddition. Mechanistic data are also presented that suggest that the reaction occurs through
通过氨基甲酸酯和3-吲哚基甲醇的正式[3 + 2]环加成反应,已开发出高度对映体和非对映体选择性的3-氨基环戊[ b ]吲哚。该转化由手性磷酸催化,该手性磷酸实现了环加成的两个配偶体的同时活化。还提供了机理数据,表明该反应通过逐步途径发生。
US5455262A
申请人:——
公开号:US5455262A
公开(公告)日:1995-10-03
A New and Efficient Epoxide Ring Opening via Poor Nucleophiles: Indole, <i>p</i>-Nitroaniline, Borane and <i>O</i>-Trimethylsilylhydroxylamine in Lithium Perchlorate
2-epoxyphenylether and allyl(2-epoxymethyl) ether are observed through reactions with poor nucleophiles such as indole, borane, O-trimethylsilylhydroxylamine, p-nitroaniline and sterically hindered tert-butylamine in the presence of 5.0 Mlithium perchlorate-Et 2 O solution. These reactions are fast, convenient, with rather high yields and are carried out at ambienttemperatures.
2,3-二甲基环氧乙烷、2-环氧苯基醚和烯丙基(2-环氧甲基)醚通过与吲哚、硼烷、O-三甲基甲硅烷基羟胺、对硝基苯胺和空间位阻叔丁胺等不良亲核试剂的反应观察到高区域选择性开环。存在 5.0 M 高氯酸锂-Et 2 O 溶液。这些反应快速、方便、产率相当高,并且在环境温度下进行。
Lewis Acid Catalyzed Intramolecular Direct Ene Reaction of Indoles
作者:Bo Han、You-Cai Xiao、Yuan Yao、Ying-Chun Chen
DOI:10.1002/anie.201005296
日期:2010.12.27
How to fuse heterocycles: The direct enamine–imine isomerization of indoles and subsequent intramolecular imino‐ene has been observed under Lewisacidcatalysis. This unique reaction occurred for indoles that contain a tethered olefin functionality, and led to fused indoline heterocycles with excellent diastereocontrol (see scheme).