作者:Stefan Tasler、Heike Endress、Gerhard Bringmann
DOI:10.1055/s-2001-17712
日期:——
The first reductive biaryl coupling of carbazoles is presented, along with the synthesis of the appropriately halogenated coupling substrates. A completely regioselective halogenation of carbazoles was achieved applying the DoM (Directed ortho-Metalation) strategy with different combinations of directing groups. In the course of the evaluation of a suitable method for benzylic oxidations of carbazolic alcohols, a new protocol using the hypervalent iodine reagent BTIB was established.
本文首次介绍了咔唑的还原双芳基偶联反应,以及适当卤代偶联底物的合成。通过不同的定向基团组合,采用 DoM(定向正金属化)策略实现了咔唑的完全区域选择性卤化。在评估咔唑醇苄基氧化的合适方法的过程中,建立了一个使用高价碘试剂 BTIB 的新方案。