Rh(III)-Catalyzed Regio- and Chemoselective [4 + 1]-Annulation of Azoxy Compounds with Diazoesters for the Synthesis of 2<i>H</i>-Indazoles: Roles of the Azoxy Oxygen Atom
作者:Zhen Long、Zhigang Wang、Danni Zhou、Danyang Wan、Jingsong You
DOI:10.1021/acs.orglett.7b00631
日期:2017.6.2
tandem C–H alkylation/intramolecular decarboxylative cyclization of azoxy compounds with diazoesters for the synthesis of 3-acyl-2H-indazoles is disclosed. The azoxy instead of the azo group enables a distinct approach for cyclative capture, leading to a [4 + 1]-annulation rather than a classic [4 + 2] manner. The azoxy oxygen atom is traceless after annulation, and further removal from the product is
1,2-Eliminations in a Novel Reductive Coupling of Nitroarenes to Give Azoxy Arenes by Sodium Bis(trimethylsilyl)amide
作者:Jih Ru Hwu、Asish R. Das、Chia Wei Yang、Jiann-Jyh Huang、Ming-Hua Hsu
DOI:10.1021/ol050924x
日期:2005.7.1
[reaction: see text]. Symmetric azoxy arenes were successfully prepared in one step from 2 equiv of the corresponding nitroarenes by use of sodium bis(trimethylsilyl)amide as the deoxygenating agents in THF at 150 degrees C in a sealed tube.
REDUCTION OF AROMATIC AND ALIPHATIC NITRO COMPOUNDS BY SODIUM HYDROGEN TELLURIDE
作者:Atsuhiro Osuka、Hirohito Shimizu、Hitomi Suzuki
DOI:10.1246/cl.1983.1373
日期:1983.9.5
Various nitro compounds were effectively reduced by sodium hydrogen telluride in good yields. Thus, reductive conversion of unhindered nitrobenzenes to azoxybenzenes, sterically hindered nitrobenzenes to anilines, nitroalkanes to dimer of nitrosoalkanes, and vicinal-dinitroalkane to olefin was achieved.
Organic photochemistry. Part VIII. The photochemical reduction of nitro-compounds
作者:J. A. Barltrop、N. J. Bunce
DOI:10.1039/j39680001467
日期:——
Aromatic nitro-compounds, when irradiated with u.v. light in organic solvents containing abstractable hydrogen atoms, give rise to reduction products, the relative proportion of which depends on the solvent and the wavelength of the exciting radiation. The overall reaction is shown to involve a sequence of photochemical and thermal steps, the first of which is a hydrogen abstraction probably by a 3(ππ*)
A convenient protocol for highly selective delivery of azoxybenzenes from reduction of nitrobenzenes was developed by utilizing a coppercatalyst. A variety of functional groups and substitution were well tolerated.