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.
Synthesis of methylene-bridged binary carbazole alkaloids and a related tricarbazole
作者:Gerhard Bringmann、Stefan Tasler
DOI:10.1016/s0040-4020(01)00104-1
日期:2001.3
The first synthesis of the methylene-bridged binary carbazole alkaloids bismurrayafoline-A and chrestifoline-A is described. As an interesting side product, a likewise benzylically connected trimer was identified, a potential natural product. (C) 2001 Elsevier Science Ltd. All rights reserved.