Synthesis of 1,1′- and 2,2′-Bicarbazole Alkaloids by Iron(III)-Catalyzed Oxidative Coupling of 2- and 1-Hydroxycarbazoles
作者:Christian Brütting、Raphael F. Fritsche、Sebastian K. Kutz、Carsten Börger、Arndt W. Schmidt、Olga Kataeva、Hans-Joachim Knölker
DOI:10.1002/chem.201704554
日期:2018.1.9
We describe the synthesis of 1,1′‐ and 2,2′‐bicarbazoles by oxidative homocoupling of 2‐ and 1‐hydroxycarbazoles. The oxidative coupling using catalytic amounts of F16PcFe can be applied to both groups of substrates. Although F16PcFe generally provides the best yields for the synthesis of 1,1′‐bicarbazoles, di‐tert‐butyl peroxide affords better results for the 2,2′‐bicarbazoles. In our study, we have