Base-promoted three-component cascade approach to unsymmetrical bis(indolyl)methanes
作者:Mohit L. Deb、Bhaskar Deka、Prakash J. Saikia、Pranjal K. Baruah
DOI:10.1016/j.tetlet.2017.04.032
日期:2017.5
base-catalyzed reaction of two different indoles with aldehydes under heating to produce unsymmetrical bis(indolyl)methanes (BIMs), in which one of the indole ring must be N-substituted. Mixture of EtOH-H2O is used as solvent. The reaction did not give symmetrical BIMs of N-substituted indoles or N–H indoles. However, traces of latter were formed in few cases, especially when electron-rich aldehydes were used
FeCl<sub>3</sub>·6H<sub>2</sub>O as a Mild Catalyst for Nucleophilic Substitution of Symmetrical Bis(indoyl)methanes
作者:Chayamon Chantana、Jaray Jaratjaroonphong
DOI:10.1021/acs.joc.0c02466
日期:2021.2.5
In this paper, unsymmetrical bis(indolyl)methane (BIM) and 3-alkylindole derivatives are smoothly synthesized from symmetrical BIMs with a variety of nucleophiles including heteroaromatic/aromatic compounds, allylsilane and alkynylsilane. FeCl3·6H2O is found to be a mild and highly effective catalyst for this nucleophilic substitution reaction in which N-methyl-2-phenylindole behaves as a good leaving
Jnsymmetrical arylbis(3-indolyl)methanes have been synthesized via a Bronsted acid catalyzed Friedel-Crafts alkylation of α-(3-indolyl)benzylamines with N-methylindole. With 5 mol% of the catalyst, the reaction proceeds smoothly under mild conditions, affording the unsymmetrical triarylmethanes in excellent yields (up to 98%).
This paper describes an efficient SN1-type reaction of 3-indolylmethanols with miscellaneous nucleophiles, featuring a catalyst-free procedure, low cost, wide substrate scope and mild reaction conditions. This approach provides green and efficient methods for the synthesis of diverse 3-substituted indolyl derivatives as well as unsymmetrical bisindolylmethanes and triarylmethanes.
本文介绍了3-吲哚甲醇与杂种亲核试剂的高效S N 1型反应,具有无催化剂操作,成本低,底物范围宽和反应条件温和的特点。这种方法为合成各种3-取代的吲哚基衍生物以及不对称的双吲哚基甲烷和三芳基甲烷提供了绿色有效的方法。