Enantioselective Friedel−Crafts Reaction of Indoles with Carbonyl Compounds Catalyzed by Bifunctional Cinchona Alkaloids
作者:Hongming Li、Yong-Qiang Wang、Li Deng
DOI:10.1021/ol061552a
日期:2006.8.1
asymmetric Friedel-Craftsreaction that, unprecedently, is applicable to a wide range of both indoles and carbonyls. The use of a readily accessible catalyst in combination with a high enantioselectivity that is insensitive to reaction concentration, temperature, air, and moisture should allow this reaction to provide useful enantioselective access to new chiral indole derivatives. [reaction: see text]
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。
Fluorinated alcohol-mediated [4 + 3] cycloaddition reaction of indolyl alcohols with cyclopentadiene
+ 3] cycloadditionreaction of 3-indolylmethanols with cyclopentadiene in hexafluoroisopropanol (HFIP), which is catalyst-free and inexpensive, and offers mild reaction conditions, wide substrate scope and convenient workup. This methodology provides the first catalyst- and additive-free [4 + 3] cycloadditionreactions of indolyl alcohols, offering a green and efficient method for the synthesis of cyclohepta[b]indole
本文介绍了3-吲哚基甲醇与环戊二烯在六氟异丙醇(HFIP)中的高效[4 + 3]环加成反应,该反应无催化剂且价格低廉,并且提供了温和的反应条件,宽泛的底物范围和方便的后处理方法。该方法学提供了吲哚醇的第一个无催化剂和无添加剂的[4 + 3]环加成反应,为合成环庚[ b ]吲哚衍生物提供了一种绿色而有效的方法。
Multistep One-Pot Synthesis of Enantioenriched Polysubstituted Cyclopenta[b]indoles
Simple steps, complex result: Consecutive organo‐catalyzed reactions of 3‐indolylmethanol compounds with aldehydes and N‐protected indoles lead to the formation of structurally complex cyclopenta[b]indoles (see scheme, Bn=benzyl). These one‐pot multistep reactions have a broad substrate scope and give the products in high yields, and with excellent diastereoselectivities and enantioselectivities.
简单的步骤,复杂的结果:3-吲哚基甲醇化合物与醛和N-保护的吲哚的连续有机催化反应会导致结构上复杂的环戊[ b ]吲哚的形成(参见方案,Bn =苄基)。这些一锅多步反应具有广泛的底物范围,可高收率地提供产物,并具有出色的非对映选择性和对映选择性。
Highly efficient [3 + 2] reaction of 3-vinylindoles with 3-indolylmethanols by Brønsted-acid catalysis
This paper describes a highly efficient [3 + 2] reaction between 3-vinylindoles and 3-indolylmethanols. Novel 2,3-bisindolylmethanes were prepared as single diastereoisomers in high yields with the promotion of 1 mol% 2-hydroxy-3,5-dinitrobenzoic acid.