Preparation and Study of 1,8-Di(pyrid-2′-yl)carbazoles
作者:Maria S. Mudadu、Ajay N. Singh、Randolph P. Thummel
DOI:10.1021/jo801132w
日期:2008.9.1
series of three derivatives of 1,8-di(pyrid-2'-yl)carbazole were prepared by Stille-type coupling of 2-(tri-n-butylstannyl)pyridine with the appropriate 1,8-dibromocarbazole. The carbazoles were prepared by appropriate substitution methodologies on the parent carbazole or by palladium-catalyzed cyclization of di-(p-tolyl)amine to provide the carbazole ring system. An X-ray structure of the di-tert-butyl
CuCl-Catalyzed Ullmann-Type C–N Cross-Coupling Reaction of Carbazoles and 2-Bromopyridine Derivatives
作者:Xiangdong Zhao、Yuanbin She、Kun Fang、Guijie Li
DOI:10.1021/acs.joc.6b02595
日期:2017.1.20
A CuCl-catalyzed Ullmann-type C-N cross coupling reaction of carbazoles and 2-bromopyridine deriva tives has been developed for the synthesis of N-heteroarylcarbazole derivatives employing 1-methyl-imidazole and t-BuOLi as ligand and base, respectively, both of which are found to significantly promote the reaction. Low cost and low loading of both catalyst and ligand, together with high reaction yields, render this practical reaction to be suitable for large-scale preparations and could be useful in material science.