Triethylbenzylammonium Chloride as a Useful and Efficient Catalyst for the Alkylation of Indole/substituted Indoles in Water: A Comparative Study between Conventional and Microwave Irradiation
green and facile method for the alkylation of indole/substituted indole in water using a phase Transfer catalyst (Triethylbenzylammonium Chloride, TEBA) to synthesise bis‐indolyl methanes (BIMs) and Michael addition of indole to α,β‐unsaturated carbonyl compounds is reported. The substitution of indoles occurred exclusively at the 3‐position and products of N‐alkylation has not been observed. However
Synthesis of Pharmacologically Active Bis(indolyl) and Tris(indolyl) Derivatives Using Chlorotrimethylsilane
作者:Nongthombam G. Singh、Chingrishon Kathing、Jims W. S. Rani、Rishan L. Nongkhlaw
DOI:10.1002/jccs.201300467
日期:2014.4
comparatively fast and efficient catalyst for carrying out electrophilic substitution reactions of indoles with various aldehydes/ketones/triethylorthoformate, yielding excellent amount of bis(indolyl)methanes/tris(indolyl)methanes. The merits of this protocol are avoidance of any external energy source, minimal reaction time, simple and easy procedure and high yield under solvent free room temperature condition
Regioselective C<sub>3</sub>Alkylation of Indoles for the Synthesis of Bis(indolyl)methanes and 3-Styryl Indoles
作者:Ruiqin Zhang、Renchao Ma、Rener Chen、Lei Wang、Yongmin Ma
DOI:10.1021/acs.joc.3c02551
日期:2024.2.2
Herein, we describe an efficient transition-metal-free regioselective C3alkylation of indoles for the synthesis of bis(indolyl)methanes and 3-styryl indoles. Nitrobenzene is employed as the oxidant to oxidize the alcohols in the presence of a strong base and the reaction avoids the use of transition metals such as Ru and Mn. The protocol provides a favorable route to access biologically active compounds
在此,我们描述了一种有效的、无过渡金属的吲哚区域选择性C 3烷基化反应,用于合成双(吲哚基)甲烷和3-苯乙烯基吲哚。采用硝基苯作为氧化剂,在强碱存在下氧化醇,该反应避免了过渡金属如Ru和Mn的使用。该方案提供了获取生物活性化合物(如芦丁、vibrindole A 和涡轮霉素 B)的有利途径。
Fischer,E., Chemische Berichte, 1886, vol. 19, p. 2988