Photocatalytic C–H Amination of Aromatics Overcoming Redox Potential Limitations
作者:Tatsuya Morofuji、Gun Ikarashi、Naokazu Kano
DOI:10.1021/acs.orglett.0c00822
日期:2020.4.3
report the photocatalytic C–H amination of aromatics overcoming redox potential limitations. Radical cations of aromatic compounds are generated photocatalytically using Ru(phen)3(PF6)2, which has a reduction potential at a high oxidation state (Ered(RuIII/RuII) = +1.37 V vs SCE) lower than the oxidation potentials of aromatic substrates (Eox = +1.65 to +2.27 V vs SCE). The radical cations are trapped
我们报道了克服氧化还原潜在限制的芳香族化合物的光催化C–H胺化反应。使用Ru(phen)3(PF 6)2光催化生成芳香族化合物的自由基阳离子,该Ru(phen)3(PF 6)2在高氧化态下的还原电势(E red(Ru III / Ru II)= +1.37 V vs SCE)低于三氧化二砷。芳香族底物的氧化电位(E ox = +1.65至+2.27 V vs SCE)。自由基阳离子被吡啶捕获,得到N-芳基吡啶鎓离子,该离子被转化为芳族胺。
Reactive intermediates. Part XI. The generation and some reactions of benzynequinone
作者:C. W. Rees、D. E. West
DOI:10.1039/j39700000583
日期:——
5-dimethoxybenzamide. Demethylation of the former with boron tribromide, followed by oxidation with silver oxide gives 1-aminobenzotriazole-4,7-quinone which, on treatment with lead tetra-acetate yields benzynequinone, isolated as 5,6,7,8-tetraphenyl-1,4-naphthoquinone from a reaction with tetracyclone. 1-Amino-5,6-dimethoxybenzotriazole is synthesised in four steps from 4-amino-5-nitroveratrole, but attempts
The interaction between imidazole and p-benzoquinone in acetonitrile was investigated at both low temperature (below 0°) and room temperature. The step of formation of the charge-transfer complex between two intact molecules could not be detected. Instead, the two compounds were found to react with each other fairly quickly at room temperature to form 2, 5-bis (imidazol-1-yl) hydroquinone, 2, 3-bis (imidazol-1-yl) hydroquinone and hydroquinone.
Electrochemical C–H Amination: Synthesis of Aromatic Primary Amines via <i>N</i>-Arylpyridinium Ions
作者:Tatsuya Morofuji、Akihiro Shimizu、Jun-ichi Yoshida
DOI:10.1021/ja402083e
日期:2013.4.3
new method for C-H amination of aromatic compounds based on electrochemical oxidation of aromatic compounds in the presence of pyridine followed by the reaction of the resulting N-arylpyridinium ions with an alkylamine. This new transformation serves as a powerful method for synthesizing aromaticprimaryamines from aromatic compounds without using metal catalysts and harsh chemical reagents. High chemoselectivity
New benzimidazolequinones as trypanosomicidal agents
作者:Claudia López-Lira、Ricardo A. Tapia、Alejandra Herrera、Michel Lapier、Juan D. Maya、Jorge Soto-Delgado、Allen G. Oliver、A. Graham Lappin、Eugenio Uriarte
DOI:10.1016/j.bioorg.2021.104823
日期:2021.6
Herein, the design and synthesis of new 2-phenyl(pyridinyl)benzimidazolequinones and their 5-phenoxy derivatives as potential anti-Trypanosoma cruzi agents are described. The compounds were evaluated in vitro against the epimastigotes and trypomastigote forms of Trypanosoma cruzi. The replacing of a benzene moiety in the naphthoquinone system by an imidazole enhanced the trypanosomicidal activity against