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。
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
First heterogeneously palladium-catalysed fully selective C3-arylation of free NH-indoles
作者:Giuseppe Cusati、Laurent Djakovitch
DOI:10.1016/j.tetlet.2008.02.130
日期:2008.4
A simple heterogeneously palladium-catalysed procedure for the selective C3-arylation of indoles is reported. Under relatively standard reaction conditions (Pd-catalyst, K(2)CO(3), dioxane, reflux), using only 1 mol % [Pd(NH(3))(4)]/NaY as the catalyst, indoles substituted or not at position 2 gave up to 92% conversion (i.e., 85% isolated yield) towards the expected C3-arylated indole. (c) 2008 Elsevier Ltd. All rights reserved.