Combined C−H Functionalization/C−N Bond Formation Route to Carbazoles
摘要:
A new method in which a series of substituted carbazoles is efficiently produced by the combination of an amide and an arene is described. The key feature of this method is the palladium-catalyzed tandem directed C-H functionalization and amide arylation. The method tolerates substitution on either ring of the biaryl amide substrates, and the products can be assembled in a simple two-step protocol from readily available reagents. The Pd(0) species generated are reoxidized to Pd(II) in the presence of Cu(OAc)2 and an atmosphere of oxygen.
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
Combined C−H Functionalization/C−N Bond Formation Route to Carbazoles
作者:W. C. Peter Tsang、Nan Zheng、Stephen L. Buchwald
DOI:10.1021/ja055353i
日期:2005.10.1
A new method in which a series of substituted carbazoles is efficiently produced by the combination of an amide and an arene is described. The key feature of this method is the palladium-catalyzed tandem directed C-H functionalization and amide arylation. The method tolerates substitution on either ring of the biaryl amide substrates, and the products can be assembled in a simple two-step protocol from readily available reagents. The Pd(0) species generated are reoxidized to Pd(II) in the presence of Cu(OAc)2 and an atmosphere of oxygen.
Transition-metal-free and organic solvent-free conversion of <i>N</i>-substituted 2-aminobiaryls into corresponding carbazoles <i>via</i> intramolecular oxidative radical cyclization induced by peroxodisulfate
作者:Palani Natarajan、Priya Priya、Deachen Chuskit
DOI:10.1039/c7gc03130k
日期:——
benign approach for the synthesis of N-substituted carbazoles from analogous 2-aminobiaryls using peroxodisulfate in water is reported. The reactions proceeded through an intramolecular oxidative radical cyclization of N-substituted 2-aminobiaryls with in situ reoxidation of the resulting radical species. When compared to known methods for the synthesis of N-substituted carbazoles from 2-amidobiaryls, this