Cu(II)-catalyzed aerobic oxidative amidation of azoarenes with amides
作者:Gang Li、Xiaoting Chen、Xulu Lv、Chunqi Jia、Panpan Gao、Ya Wang、Suling Yang
DOI:10.1007/s11426-017-9175-2
日期:2018.6
dehydrogenative amidation of azoarene using air as the terminal oxidant was developed. Various amides, such as arylamides, alkylamides, lactams, and imides, are all effective amidation reagents and provide the desired products in moderate to excellent yields. Notably, good yields can also be obtained on a gram-scale with this amidation reaction. In this protocol of azoarene amidation, the catalyst (Cu(OAc)2)
A metal-free direct oxidative dehydrogenation approach for the synthesis of azobenzenesfrom hydrazobenzenes has been developed by using TEMPO as an organocatalyst for the first time. The reaction proceeded in open air under mild reaction conditions. A wide range of hydrazobenzenes readily undergo dehydrogenation to give the corresponding azobenzenes in excellent yields.
<i>N</i>,<i>N</i>-Diisopropylethylamine-Mediated Electrochemical Reduction of Azobenzenes in Dichloromethane
作者:Hongyan Zhou、Rundong Fan、Jingya Yang、Ximei Sun、Xiaojun Liu、Xi-Cun Wang
DOI:10.1021/acs.joc.2c01949
日期:2022.11.4
report a cathodic reduction-dominated electrochemical approach for the hydrogenation of azobenzenes in dichloromethane. With cheap and readily available N,N-diisopropylethylamine as a catalytic mediator, the reaction proceeded smoothly in a simple undivided cell under constant-current electrolysis. A series of azobenzenes were successfully reduced to the corresponding hydrazobenzenes in moderate to high
Chemodivergent coupling of azoarenes with benzyl alcohols via borrowing hydrogen strategy using a well-defined nickel catalyst
作者:Sadhna Bansal、Rajesh G. Gonnade、Benudhar Punji
DOI:10.1039/d3cy00090g
日期:——
Chemodivergent (de)hydrogenativecoupling of azoarenes with benzylalcohols is achieved via the NN bond activation using an inexpensive and well-defined (6-OH-bpy)NiCl2 catalyst. This protocol highlights the construction of C–N bonds via a borrowinghydrogenstrategy that offers substituted imines and amines. A range of azo compounds couple with various substituted benzylalcohols in a tandem hydrogenation/dehydrogenation
使用廉价且定义明确的 (6-OH-bpy)NiCl 2催化剂通过NN键活化实现偶氮芳烃与苯甲醇的化学发散(脱)氢偶联。该协议强调了通过提供取代亚胺和胺的借氢策略构建 C-N 键。在串联氢化/脱氢过程中,一系列偶氮化合物与各种取代的苯甲醇偶联。镍催化剂连同 K 2 CO 3或 KO tBu 碱控制亚胺和胺形成的选择性。一项初步的机理研究确定了金属-配体合作 (MLC) 的关键作用,包括不同的自由基途径。
In‐situ Oxidation and Coupling of Anilines towards Unsymmetric Azobenzenes Using Flow Chemistry
作者:Jan H. Griwatz、Chiara E. Campi、Anne Kunz、Hermann A. Wegner
DOI:10.1002/cssc.202301714
日期:2024.5.21
Azobenzenes are often accessed via the Baeyer-Mills reaction of an aniline with a nitrosobenzene. To minimize the hazards while working with such substances, we herein report an in-situ preparation of a large scope of different nitrosobenzene derivatives. These were used in a telescoped Baeyer-Mills reaction of unsymmetric azobenzenes.