Molybdenum-catalyzed deoxygenative heterocyclization of 2-nitroazobenzenes: a novel strategy for catalytic synthesis of 2-aryl-2<i>H</i>-benzo[<i>d</i>][1,2,3]triazoles
A novel strategy for the catalytic synthesis of 2-aryl-2H-benzo[d][1,2,3]triazoles bearing a wide range of functional groups in good to excellent yields by non-noble molybdenum-catalyzed deoxygenative heterocyclization of 2-nitroazobenzenes is described. The salient features of the transformation include the use of readily available substrates, valuable products and ease of scale-up. The mechanistic
一种通过非贵重钼催化的2的脱氧杂环化催化合成具有多种官能团的2-芳基-2H-苯并[ d ][1,2,3]三唑的新策略,收率良好至优异描述了-硝基偶氮苯。该转化的显着特点包括使用现成的底物、有价值的产品和易于扩大规模。机理研究表明该反应是通过Mo( VI )/Mo( IV )催化循环从2-硝基偶氮苯进行双重脱氧,形成2-芳基-2H-苯并[ d ][1,2,3 ]三唑-N 1 -氧化物或氮烯中间体。
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作者:D. L. Lipilin、A. M. Churakov、Yu. A. Strelenko、V. A. Tartakovsky
DOI:10.1023/a:1015463912286
日期:——
Tin(II) chloride selectively reduces the aromatic nitro group to the amino group, the azoxy group remaining intact. This allows the preparation of 2-(R-NNO-azoxy)anilines from 2-(R-NNO-azoxy)nitrobenzenes bearing electron-donating or weak electron-withdrawing substituents (Me or Br) in the benzene ring and alkyl substituents at the distal N atom of the azoxy group. The presence of electron-withdrawing substituents at the azoxy group (for example, CO2Et) leads to a change in the direction of the reaction resulting in selective reduction of the azoxy group to the hydrazo group.
Sulfonyldiazene-N-oxides
作者:E. N. Khodot、L. G. Svirskaya、I. E. Chlenov
DOI:10.1007/bf00699839
日期:1994.4
Sulfonyldiazene-N-oxides 2 and 3 were obtained by treatment of sulfamide with nitroso compounds 1 in the presence of 1,3-dibromoisocyanurate (DBI) in neutral and acid media.
<i>Para</i>-Selective Halogenation of Nitrosoarenes with Copper(II) Halides
作者:Angela van der Werf、Nicklas Selander
DOI:10.1021/acs.orglett.5b03198
日期:2015.12.18
The para-selective direct bromination and chlorination of nitrosoarenes with copper(II) bromide and chloride is reported. Under mild reaction conditions, a range of halogenated arylnitroso compounds are obtained in moderate to good yields with high regioselectivity. Additionally, the versatility of the method is demonstrated by the development of a one-pot procedure to obtain the corresponding para-halogenated
Selective and Scalable Electrosynthesis of
<i>2H</i>
‐2‐(Aryl)‐benzo[
<i>d</i>
]‐1,2,3‐triazoles and Their N‐Oxides by Using Leaded Bronze Cathodes
作者:Tom Wirtanen、Eduardo Rodrigo、Siegfried R. Waldvogel
DOI:10.1002/chem.201905874
日期:2020.5.4
undivided cell under constant current conditions with a leaded bronze cathode and a glassy carbon anode. The product distribution between 2H-2-(aryl)benzo[d]-1,2,3-triazoles and their N-oxides can be guided by simply controlling the current density and the amount of the charge applied. The reaction tolerates several sensitive functional groups in reductive electrochemistry. The usefulness and the applicability