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.
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。
Oxidative dehydrogenation of hydrazines and diarylamines using a polyoxomolybdate-based iron catalyst
We report an efficient method for the oxidativedehydrogenation of hydrazines and diarylamines in aqueous ethanol using Anderson-type polyoxomolybdate-based iron(III) as a catalyst and hydrogen peroxide as an oxidant. A series of azo compounds and tetraarylhydrazines were obtained in moderate to excellent yields. The reaction conditions and substrate scopes are complementary or superior to those of
我们报告了一种使用安德森型多氧钼酸铁 ( III ) 作为催化剂和过氧化氢作为氧化剂在乙醇水溶液中氧化脱氢肼和二芳基胺的有效方法。以中等至极好的收率获得了一系列偶氮化合物和四芳基肼。反应条件和底物范围补充或优于更成熟的方案。此外,该催化剂在水中表现出良好的稳定性和重复使用性。初步的机理研究表明,该反应涉及一个自由基过程。
Visible-Light-Mediated Hydroacylation of Azobenzenes with α-Keto Acids
作者:Jingya Yang、Menghui Song、Hongyan Zhou、Ganggang Wang、Ben Ma、Yuanyuan Qi、Congde Huo
DOI:10.1021/acs.orglett.0c03039
日期:2020.11.6
A visible-light-mediated protocol for the hydroacylation of azobenzenes with α-keto acids has been developed. In the absence of any catalyst or additive, decarboxylative hydroacylation proceeded smoothly under visible-light irradiation at room temperature. A wide range of azobenzenes and α-keto acids were well-tolerated and afforded hydroacylation products in high to excellent yields. Preliminary investigations
Visible-light-promoted decarboxylative addition cyclization of <i>N</i>-aryl glycines and azobenzenes to access 1,2,4-triazolidines
作者:Jingya Yang、Menghui Song、Hongyan Zhou、Yanfang Qi、Ben Ma、Xi-Cun Wang
DOI:10.1039/d1gc02272e
日期:——
Direct synthesis of 1,2,4-triazolidines have been readily achieved by the visible-light-promoted reaction of N-aryl glycines and azobenzenes under mild conditions.