Facile Cu(I)-Catalyzed Oxidative Coupling of Anilines to Azo Compounds and Hydrazines with Diaziridinone under Mild Conditions
作者:Yingguang Zhu、Yian Shi
DOI:10.1021/ol4005917
日期:2013.4.19
A mild and highly efficient Cu(I)-catalyzed oxidative coupling of anilines is described. Various primary and secondary anilines can be efficiently coupled under mild conditions to the corresponding azo compounds and hydrazines in high yields. This method provides a direct and practical access to these compounds and is also amenable to gram scale with no special precautions to exclude air or moisture
A new approach has been established for Rh(iii)-catalyzed direct aza oxidative cyclization of non-prefunctionalized azobenzenes to provide 2-aryl-2H-benzotriazoles in good yields.
Merging Visible-Light Photocatalysis and Palladium Catalysis for C−H Acylation of Azo- and Azoxybenzenes with α-Keto Acids
作者:Ning Xu、Pinhua Li、Zuguang Xie、Lei Wang
DOI:10.1002/chem.201504530
日期:2016.2.12
efficient C−H acylation of azo‐ and azoxybenzenes with α‐keto acids has been developed by a combination of palladium catalysis and visible‐light photoredox catalysis at room temperature under 1.5 W blue LED irradiation. This method tolerates a variety of disubstituted azo‐ and azoxybenzenes, as well as α‐keto acids regardless of the nature of the substituents. A number of aryl ketones were obtained
<i>ortho</i>-Heteroarylation of Azobenzenes by Rh-Catalyzed Cross-Dehydrogenative Coupling: An Approach to Conjugated Biaryls
作者:Hong Deng、Hongji Li、Lei Wang
DOI:10.1021/acs.orglett.6b01277
日期:2016.7.1
A direct cross-dehydrogenative coupling strategy for ortho-C–H activation and functionalization of azobenzenes with heteroarenes in the presence of a Rh catalyst was developed. Excellent regioselectivity was achieved by azo-coordinated Rh to realize oxidative C–H/C–H cross-coupling, providing a series of π-conjugated biaryls in good yields.
molybdenum oxide compound, [N(C4H9)4]2[Mo6O19] (1), catalyzed selective oxidation of anilines with hydrogen peroxide as green oxidant. The oxidation of anilines can be realized in a fully selectively fashion to afford various symmetric/asymmetric azobenzene and azoxybenzene compounds, respectively, by changing additive and solvent, avoiding the use of stoichiometric metal oxidants. Preliminary mechanistic
在医药和工业应用中起重要作用的芳族偶氮化合物在合成中仍然面临巨大挑战。在此,我们报道了一种氧化钼化合物[N(C 4 H 9)4 ] 2 [Mo 6 O 19 ](1),用过氧化氢作为绿色氧化剂催化苯胺的选择性氧化。苯胺的氧化可以完全选择性地实现,通过改变添加剂和溶剂避免使用化学计量的金属氧化剂,从而分别提供各种对称/不对称的偶氮苯和and氧基苯化合物。初步的机理研究表明,高活性的反应性和难以捉摸的钼亚胺配合物是中间的。