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。
Metal-free photocatalysis at charged aqueous interfaces: boosting the photocatalytic oxidative coupling of arylamines to azoaromatics under ambient conditions
作者:Shivendra Singh、Vidhi Agarwal、Tridib K. Sarma、Tushar Kanti Mukherjee
DOI:10.1039/d3gc03150k
日期:——
as the photocatalyst (PC) and arylamines as substrates for a non-diffusive photoinduced electron transfer (PET) with a time constant of 0.3 ps. The present approach shows fast kinetics (4 h) and a broad substrate scope with only 0.6 mol% of PC. Our present approach outperforms all the previously reported catalytic methodologies. This remarkable boosting of the catalytic efficacy arises mainly due to
偶氮芳烃是一类重要的功能有机分子。在此,我们在胶束的带电水界面(CAI)上配制了芳基胺与偶氮芳香族化合物的可持续无金属光催化氧化偶联,在环境空气气氛下具有优异的收率(高达100%)和选择性(100%)。胶束表面充当有效的支架,承载曙红 Y (EY) 作为光催化剂 (PC) 和芳胺作为非扩散光诱导电子转移 (PET) 的底物,时间常数为 0.3 ps。本方法显示出快速的动力学(4 小时)和广泛的底物范围,仅含有 0.6 mol% 的 PC。我们目前的方法优于之前报道的所有催化方法。催化效率的显着提高主要归功于非扩散 PET 和 CAI 氧化还原电位的调节。作为关于偶氮化合物水相合成的最可持续的第一份报告,这项工作为偶氮芳烃的合成开辟了新的机会。
Thallium in organic synthesis. 53. Simple procedures for the replacement of a phenolic OH group by N = NAr, N = O, H, NH2, and C substituents
作者:Edward C. Taylor、G. Erik Jagdmann、Alexander McKillop
DOI:10.1021/jo00416a035
日期:1978.10
Visible-light-promoted oxidative dehydrogenation of hydrazobenzenes and transfer hydrogenation of azobenzenes
作者:Xianya Wang、Xianjin Wang、Chungu Xia、Lipeng Wu
DOI:10.1039/c9gc01618j
日期:——
synthesize azo compounds from hydrazine derivatives. The use of visible-light with air as the oxidant makes this process sustainable and practical. Moreover, the visible-light-driven, photo-redox-catalyzed transfer hydrogenation of azobenzenes is compatible with a series of hydrogen donors such as phenyl hydrazine and cyclic amines. Compared with traditional (thermal/transition-metal) methods, our process avoids
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