我们已经开发出了一种使用容易获得的硼氧烷(脱水硼酸)作为偶联伙伴,对吲哚进行Pd(0)催化的脱芳香基syn 1,2-二芳基化的方案。该反应使用P t Bu 3作为配体有效地进行,以发散地接近稠合的二氢吲哚,同时最小化直接铃木偶联的程度。反应的范围非常广泛,所有产物均以单一非对映异构体的形式获得,产率中等至优异。我们还编辑了一些数据,这些数据使底物和环硼氧烷的空间和电子特性与直接Suzuki偶联过程中经历所需的脱芳香性过程的倾向相平行。
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。
On the Barton Copper‐Catalyzed C3‐Arylation of Indoles using Triarylbismuth bis(trifluoroacetate) Reagents
作者:Ahmed Fnaiche、Bianca Bueno、Claire L. McMullin、Alexandre Gagnon
DOI:10.1002/cplu.202200465
日期:——
The C3-arylation of C2-substituted indoles using Barton's protocol is investigated. The reaction is performed using triarylbismuth bis(trifluoroacetates) and is catalyzed by copper bis(trifluoroacetate). The reaction operates under mild conditions, shows excellent substrate scope, and demonstrates good function group tolerance. Electron neutral or poor aryl groups substituted at any position are efficiently