通过3,8-二羟基苯并[ c ]肉啉与重氮化芳胺的偶联反应制备了一系列双偶氮苯并[ c ]肉啉染料。这些染料的结构使用 UV-Vis、FTIR、1 H NMR、LC-MS/MS 和 LC-MS/TOF 光谱技术确认。染料12 的13 C NMR、13 C-DEPT、1 H– 1 H COSY、1 H– 13 C HMQC 和1 H– 13 C HMBC 光谱在这项研究中得到了证明。此外,还研究了苯环上的取代基、溶剂和酸碱对染料紫外-可见光谱的影响。此外,四个disazobenzo的伏安和光谱电化学行为[ Ç ]噌啉(2,8,11和13的乙腈溶液)(ACN)溶液也进行了评价。观察到双偶氮苯并[ c ]肉啉衍生物在乙腈-四丁基高氯酸铵(ACN-TBAP)溶液中表现出可逆的伏安行为。方波电位阶跃法与光谱结合用于探测染料的切换时间和光学对比度。
A metal‐free deoxygenation and reductive disilylation of nitroarenes was achieved using N,N′‐bis(trimethylsilyl)‐4,4′‐bipyridinylidene (1) under mild and neutral reaction conditions, and a broad functional group tolerance was possible in this reaction. Mono‐deoxygenation, giving a synthetically valuable N,O‐bis(trimethylsilyl)phenylhydroxylamine (7 a) as a readily available and safe phenylnitrene source
使用N,N'-双(三甲基甲硅烷基)-4,4'-联吡啶亚烷基(1)在温和和中性的反应条件下实现了硝基芳烃的无金属脱氧和还原二甲硅烷基化反应,并且该反应可能具有广泛的官能团耐受性。单脱氧可得到合成上有价值的N,O-双(三甲基甲硅烷基)苯羟胺(7 a),是一种容易获得且安全的硝基苯来源的苯基亚硝酸,双脱氧可得到N,N-双(三甲基硅烷基)苯胺8。改变1的量很容易控制反应温度以及加入二苯并噻吩(DBTP)。2-芳基硝基苯与1的反应通过N,O-双(三甲基甲硅烷基)苯基羟胺7的热解衍生的原位生成的亚苯基硝基苯胺生成相应的咔唑14,随后将其插入分子内CH。此外,分子内的N-N偶联反应将2,2'-二硝基联苯衍生物还原1,得到相应的苯并[ c ]喹啉。
Decarboxylative homocoupling of (hetero)aromatic carboxylic acids
作者:Josep Cornella、Hicham Lahlali、Igor Larrosa
DOI:10.1039/c0cc01943g
日期:——
A variety of hetero(aromatic) carboxylicacids are shown to undergo decarboxylative homocoupling, mediated by a Pd/Ag system. This novel methodology for the synthesis of symmetrical biaryls avoids the use of haloarenes and organometallic compounds as starting materials.
Biaryl Formation in the Copper(I) Mediated Arylation of Stable Enolate Anions with<i>o</i>-Halogenonitrobenzenes
作者:Singanallore V. Thiruvikraman、Hitomi Suzuki
DOI:10.1246/bcsj.58.1597
日期:1985.5
o-Bromo- and o-iodonitrobenzenes react with stable enolate anions in hot DMF in the presence of copper(I) iodide, to afford not the expected arylation products but the coupling products, 2,2′-dinitrobiphenyls.
radical mechanism through the nitroso radical anion. The novel process affords either benzo[c]cinnoline or benzo[c]cinnolineN-oxide, both in high yields, 93% and 91%, respectively. To obtain benzo[c]cinnoline, the reaction is conducted with an alcohol as solvent and an alkoxide as the base, while for benzo[c]cinnolineN-oxide, water is used as solvent with sodium hydroxide as the base. To establish the latter
已经发现并研究了导致苯并[ c ]肉桂醇骨架的新型合成方法。该过程由两个独立的反应组成,第一个是2,2'-二硝基联苯的硝基部分还原,我们认为该过程是通过SET机理进行的,从而得到羟氨基和亚硝基。在接下来的步骤中,环化是在形成-N N-键的情况下进行的。我们认为该过程是通过亚硝基自由基阴离子的自由基机理发生的。该新方法提供了苯并[ c ]肉桂啉或苯并[ c ]肉桂啉N-氧化物,两者的收率均很高,分别为93%和91%。获得苯并[ c在] cinnoline中,反应以醇为溶剂,以醇盐为碱,而对于苯并[ c ] cinnoline N-氧化物,则以水为溶剂,以氢氧化钠为碱。为了建立后一程序,利用统计实验设计和多变量建模来揭示反应的响应面并确定反应的最佳条件。提出了复杂反应机理的建议。在证实该机理的过程中,发现了一种新的脱氧反应,该反应将苯并[ c ] cinnoline N-氧化物转化为苯并[ c
Facile synthesis of 2,2′-dinitrosubstituted biaryls through Cu-catalyzed ligand-free decarboxylative homocoupling of ortho-nitrobenzoic acids
作者:Zhengjiang Fu、Zhaojie Li、Qiheng Xiong、Hu Cai
DOI:10.1039/c5ra07771k
日期:——
A novel waste-free Cu-catalyzed decarboxylative homocoupling of ortho-nitrobenzoic acids with different substituents on the phenyl core has been developed.