Rh(III)-catalyzed [4 + 1]-annulation of azobenzenes with α- carbonyl sulfoxonium ylides toward 3-acyl-(2H)-indazoles
作者:Jiawei Zhu、Song Sun、Jiang Cheng
DOI:10.1016/j.tetlet.2018.05.001
日期:2018.6
A Rh(III)-catalyzed [4 + 1]-annulation of azobenzenes with α- carbonylsulfoxoniumylides was developed to access 2H-indazoles in moderate to excellent yields with good functional group compatibilities. It proceeded with the sequential insertion of the Rh(III) carbene to the C−H bond and cyclization steps, where sulfoxoniumylides served as efficient and stable carbene precursor.
Rh(III)-catalyzed annulation of azobenzenes and α-Cl ketones toward 3-acyl-2H-indazoles
作者:Huan Li、Yuxuan Han、Zi Yang、Zhenyu Yao、Lianhui Wang、Xiuling Cui
DOI:10.1016/j.cclet.2020.12.027
日期:2021.5
afforded in up to 97% yields for more than 30 examples. The obtained products are potentiallyvaluable in organic synthesis and drug discovery. This protocol featured with high efficiency, extensive functional group tolerance and mild reaction conditions. The one-step efficient construction of an anti-inflammatory agent confirms the practicability of this procedure.
Silver-catalyzed [3+2]-cycloaddition of benzynes with diazocarbonyl species via a postulated (1H-indazol-1-yl)silver intermediate
作者:Chiou-Dong Wang、Rai-Shung Liu
DOI:10.1039/c2ob26760h
日期:——
We reported a new synthesis of 2-aryl-2H-indazoles via a silver-catalyzed [3+2]-cycloaddition of benzynes with diazocarbonyl reagents. We postulate that this transformation involves the generation of (1H-indazol-1-yl)silver to activate a subsequent arylation with the second benzyne.