Synthesis of 2,2′-Biscarbazoles by Reductive Biaryl Coupling
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.