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。