已经公开了2,2'-二叠氮联苯对C 60和Sc 3 N@ I h -C 80的不同反应性。就 C 60而言,脱芳香级联反应导致形成与 7-6-5 元环系统融合的氮杂富勒烯,而 Sc 3 N@ I h -C 80则经历 CH 插入途径,其中生成咔唑衍生的[6,6]-和[5,6]-氮杂金属富勒烯以及不寻常的1,2,3,6-四氢吡咯并[3,2- c ]咔唑衍生的金属富勒烯。
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。
Synthesis of Biaryls by Pd-Catalyzed Decarboxylative Homo- and Heterocoupling of Substituted Benzoic Acids
作者:Kai Xie、Sizhuo Wang、Zhiyong Yang、Jidan Liu、Anwei Wang、Xiujian Li、Ze Tan、Can-Cheng Guo、Wei Deng
DOI:10.1002/ejoc.201100913
日期:2011.10
base, symmetrical and unsymmetrical biaryls can be readily synthesized through the Pd-catalyzed decarboxylative homo- and heterocoupling of substituted benzoic acids. The reaction gave the desired products in 40–90 % yield and is compatible with 2-nitro-, 2-methoxy-, 2-fluoro-, and 2-chloro-substituted benzoic acids.
We synthesized various carbazoles from anilines through a three-step process with good overall yields (up to 48%). This process comprises N-acetylation, copper(0)-mediated Ullmann homocoupling, and acid-mediated intramolecular amination. It permits various functional groups on the substrate. Scale-up of the developed three-step synthetic route to carbazoles was also demonstrated.
Preparation du compose du titre (de structure semblable au coronene mais a 7 cycles benzeniques) a partir de la condensation du bis-bromomethyl-2,7 naphtalene et du bis-mercaptomethyl-3,3' dimethyl-6,6' biphenyle
制备 du compose du titre (de structure semblable au coronene mais a 7 cycle benzeniques) a partir de la condensation du bis-bromomethyl-2,7naphtalene et du bis-mercaptomethyl-3,3' dimethyl-6,6' biphenyle