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.
Pd(<scp>ii</scp>) pincer type complex catalyzed tandem C–H and N–H activation of acetanilide in aqueous media: a concise access to functionalized carbazoles in a single step
One-pot, tandem C-H and N-H activation of acetanilides with aryl boronic acids to realize functionalized carbazoles were conveniently performed under aerobic conditions using a novel NNO pincer type Pd(II)complex [Pd(L)Cl]...
Palladium nanomaterials in catalytic intramolecular C–H amination reactions
作者:Leng Leng Chng、Jun Yang、Yifeng Wei、Jackie Y. Ying
DOI:10.1039/c4cc03551h
日期:——
Supported palladium nanomaterials catalyzed an intramolecular CâH amination reaction to produce carbazoles in moderate to excellent isolated yields, up to 92%.
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.