Carbazoles were successfully synthesized by oxidative cyclization of the corresponding diaryl derivatives using electrochemically generated hypervalent iodine oxidant. Electron-withdrawing nitro and donating methoxy groups at the para position of the acetamide group interfered with cyclization. Glycozoline (8) was successfully synthesized in five steps with 50% overall yield.
Synthesis of the Carbazole Scaffold Directly from 2-Aminobiphenyl by Means of Tandem C-H Activation and C-N Bond Formation
作者:Hans-René Bjørsvik、Vijayaragavan Elumalai
DOI:10.1002/ejoc.201601191
日期:2016.11
An efficient method for the synthesis of the carbazolescaffold was designed and investigated. The method was developed to produce substituted carbazoles by an intramolecular combination of a free amine group and an arene. The steps of the method involved tandem Pd-catalyzed C–Hactivation and intramolecular C–Nbondformation. The method showed good functional group tolerance, and substituent(s) could
Palladium-Catalyzed Method for the Synthesis of Carbazoles via Tandem C−H Functionalization and C−N Bond Formation
作者:W. C. Peter Tsang、Rachel H. Munday、Gordon Brasche、Nan Zheng、Stephen L. Buchwald
DOI:10.1021/jo801273q
日期:2008.10.3
The development of a new method for the assembly of unsymmetrical carbazoles is reported. The strategy involves the selective intramolecular functionalization of an arene C-Hbond and the formation of a new arene C-Nbond. The substitution pattern of the carbazole product can be controlled by the design of the biaryl amide substrate, and the method is compatible with a variety of functional groups
Syntheses and photophysical properties of fluorescent dibenzofurans, a dibenzothiophene, and carbazoles substituted with benzoxazole and hydroxyl groups to produce excited state intramolecular proton-transfer
作者:Joel M. Kauffman、Peter T. Litak、Walter J. Boyko
DOI:10.1002/jhet.5570320523
日期:1995.9
Dibenzofurans, a dibenzothiophene, and carbazoles, each substituted with a 2-benzoxazolyl group as well as an ortho-hydroxyl group, were synthesized to produce fluors with fluorescence due to excited-state intramolecular proton-transfer. The orientations for Friedel-Crafts acylation of 3-methoxydibenzothio-phene and of the analogous carbazole were determined. The fluors displayed absorption peaks in
Asymmetric oxidative coupling of hydroxycarbazoles: Facile synthesis of (+)-bi-2-hydroxy-3-methylcarbazole
作者:Makoto Sako、Akimasa Sugizaki、Shinobu Takizawa
DOI:10.1016/j.bmcl.2018.02.033
日期:2018.9
Asymmetricoxidativecoupling reactions of hydroxycarbazoles have been established using a chiral dinuclear vanadium complex. To demonstrate the utility of vanadium-catalyzed reactions, we have used them to synthesize (+)-bi-2-hydroxy-3-carbazole in three steps from cyclohexanone and commercially available aniline derivatives.