The 4.4′-benzidine rearrangement of 4-alkyl substituted hydrazobenzenes
作者:Marc E. Bouillon、Hartmut H. Meyer
DOI:10.1016/j.tet.2016.03.103
日期:2016.6
When treated with dilute inorganic acids N,N′-diarylhydrazines (hydrazobenzenes) with an alkyl substituent in the 4-position undergo [5,5]-sigmatropic rearrangement reactions to furnish 4-(4′-aminophenyl)-4-alkylcyclohexa-2,5-dienimines (ipso-benzidines) in moderate to excellent yields. Steric bulk of the 4-alkyl substituent in the starting material decreases the yield of the respective ipso-benzidine
N-alkylation of diazo compounds: Value-added to industry waste diazo compounds using feedstock alcohols under earth-abundant manganese catalysis.alcoholdehydrogenative couplingdrug intermediateshydrogenkinetic studiesmanganese
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:——
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.