A simple, direct synthesis of 3-vinylindoles from the carbocation-catalysed dehydrative cross-coupling of ketones and indoles. A combined experimental and computational study
straightforward synthesis of a library of largely new 3-vinylindoles via a clean dehydrative coupling reaction between ketones and indoles has been developed. Highly stable, non-nucleophilic aryl(2-methylindol-3-yl)methylium salts have been used as efficient Lewis acid catalysts. The advantages of the reaction are the use of equimolar amounts of inexpensive and easily available reagents, the low catalyst amount
A direct dehydrative coupling protocol for the synthesis of 3-vinylindoles using easily available indoles and simple ketones as substrates was developed with the aid of a sulfonyl-containing Brønsted acid ionic liquid. The salient features of this protocol are high synthetic efficiency, a metal- and solvent-free system, a recyclable catalyst, mild conditions and easy product isolation. With the ionic
借助含磺酰基的布朗斯台德酸离子液体,开发了一种使用容易获得的吲哚和简单的酮为底物合成3-乙烯基吲哚的直接脱水偶联方案。该协议的主要特点是合成效率高,无金属和无溶剂系统,可循环使用的催化剂,条件温和且产品易于分离。使用离子液体催化剂,还以2-羟基甲基吲哚和苯乙酮为起始原料,开发了迄今为止尚未报道的简单的吲哚[3,2- b ]咔唑骨架的构建方法。
Indium(III) bromide-catalyzed hydroarylation of alkynes with indoles
作者:G. Bhaskar、C. Saikumar、P.T. Perumal
DOI:10.1016/j.tetlet.2010.04.036
日期:2010.6
Indium(111) bromide-catalyzed hydroarylation of alkynes with indoles leading to the synthesis of 3-vinylincloles in good to excellent yields was achieved. The E/Z ratio of the products depends on the substituents on the indole. This protocol is efficient and atom-economic from the synthetic point of view. (C) 2010 Elsevier Ltd. All rights reserved.