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.
Borsche; Buetschli, Justus Liebigs Annalen der Chemie, 1936, vol. 522, p. 285,289
作者:Borsche、Buetschli
DOI:——
日期:——
An efficient transition-metal-free synthesis of 1H-indazoles from arylhydrazones with montmorillonite K-10 under O2 atmosphere
作者:Jin Yu、Jin Woo Lim、Su Yeon Kim、Jimin Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2015.01.183
日期:2015.3
An efficient transition-metal-free synthetic method of 1H-indazoles has been developed. The reaction of arylhydrazones in the presence of montmorillonite K-10 in 1,2-dichlorobenzene at 130 degrees C afforded 1Hindazoles in good yields most likely via a sequential intramolecular nucleophilic cyclization and an aerobic oxidation pathway. (C) 2015 Elsevier Ltd. All rights reserved.
[Bis-(trifluoroacetoxy)iodo]benzene-Mediated Oxidative Direct Amination C-N Bond Formation: Synthesis of 1<i>H</i>-Indazoles
作者:Zhiguo Zhang、Yuanyuan Huang、Guoqing Huang、Guisheng Zhang、Qingfeng Liu
DOI:10.1002/jhet.2839
日期:2017.7
An efficient [bis‐(trifluoroacetoxy)iodo]benzene (PIFA)‐mediated oxidative C‐N bond formation is developed for the synthesis of 1H‐indazoles from readily available arylhydrazones. The reaction tolerates a wide range of functional groups and has broad scope of substrates. Moreover, this method is a relative green and reliable method for rapid preparation of substituted 1H‐indazoles under mild conditions