Transition‐Metal‐Free Oxidative Cross‐Coupling of Tetraarylborates to Biaryls Using Organic Oxidants
作者:Carolin Gerleve、Armido Studer
DOI:10.1002/anie.202002595
日期:2020.9
tetraarylborates undergo selective (cross)‐coupling through oxidation with Bobbitt's salt to give symmetric and unsymmetric biaryls. The organic oxoammonium salt can be used either as a stoichiometric oxidant or as a catalyst in combination with in situ generated NO2 and molecular oxygen as the terminal oxidant. For selected cases, oxidative coupling is also possible with NO2/O2 without any additional
容易制备的四芳基硼酸盐通过用博比特盐氧化进行选择性(交叉)偶联,得到对称和不对称的联芳基化合物。有机氧铵盐可用作化学计量氧化剂或与原位产生的NO 2和作为末端氧化剂的分子氧组合用作催化剂。对于某些情况,也可以使用 NO 2 /O 2进行氧化偶联,无需任何额外的氮氧自由基助催化剂。四芳基硼酸盐的无过渡金属催化氧化配体交叉偶联是前所未有的,所引入的方法提供了获得各种联芳基和杂联芳基系统的途径。
Anil-Synthese 22. Mitteilung über die Herstellung von Styryl-und Distyryl-Derivaten des Pyridins
作者:Adolf Emil Siegrist、Hans Rudolf Meyer、Peter Gassmann、Serge Moss
DOI:10.1002/hlca.19800630524
日期:1980.7.9
Preparation of Styryl and Distyryl Derivatives of Pyridine
吡啶的苯乙烯基和二苯乙烯基衍生物的制备
Palladium-Catalyzed Zinc-Amide-Mediated CH Arylation of Fluoroarenes and Heteroarenes with Aryl Sulfides
作者:Shinya Otsuka、Hideki Yorimitsu、Atsuhiro Osuka
DOI:10.1002/chem.201502101
日期:2015.10.12
heteroarenes with aryl sulfides proceeds smoothly with the aid of a palladium–N‐heterocyclic carbene catalyst. A bulky zinc amide, TMPZnCl⋅LiCl, plays a key role as an effective base to generate the corresponding arylzinc species in situ. This arylation protocol is practically much easier to perform than our previous method, which necessitates preparation of the arylzincreagents in advance from the corresponding
Ç polyfluoroarenes和杂芳烃的与芳基硫化物ħ芳基化用钯- N-杂环卡宾催化剂的帮助下顺利进行。甲笨重锌酰胺,TMPZnCl ⋅的LiCl,起着以原位产生相应的芳基锌物种的有效碱关键作用。该芳基化方案实际上比我们以前的方法更容易执行,后者需要从相应的芳基卤化物预先制备芳基锌试剂。通过硫特异性反应(如S N Ar磺酰化反应和扩展的Pummerer反应)制备的芳基硫化物会经历这种直接芳基化,从而提供有趣的转化,而这些转化是传统的基于卤素的有机合成难以实现的。
A tridentate CNO-donor palladium(II) complex as efficient catalyst for direct C―H arylation: Application in preparation of imidazole-based push-pull chromophores
作者:Hui-Hong Li、Ratnava Maitra、Ya-Ting Kuo、Jie-Hong Chen、Ching-Han Hu、Hon Man Lee
DOI:10.1002/aoc.3956
日期:2018.1
A series of imidazolium chlorides for the formation of tridentate CNO‐donor palladium(II) complexes featuring N‐heterocycliccarbene moieties have been developed from cheap and readily available starting materials with high yields. Their palladium complexes were prepared by reactions between the ligand precursors and PdCl2 using K2CO3 as base in pyridine with reasonable yields. These air‐stable metal
已经开发出了一系列廉价的易得原料,并以高收率开发了一系列咪唑氯化物,用于形成三齿CNO-供体钯(II)配合物,这些配合物具有N-杂环卡宾部分。他们的钯配合物是通过在吡啶中使用K 2 CO 3作为碱,通过配体前体与PdCl 2之间的反应制备的,并具有合理的收率。使用1 H NMR和13 C 11 H NMR光谱和元素分析。进行了异核多键相关实验,以鉴定这些化合物的关键NMR信号。还通过单晶X射线衍射分析确定了两种配合物的结构。这些配合物中的一种已成功应用于杂环化合物与芳基溴化物之间的直接C–H功能化反应中,产生了优异的偶联产物收率。偶联反应是可扩展的,允许仅2mol%的Pd负载获得几克偶联产物。开发的催化剂系统可以直接大规模制备多个推挽生色团。研究了这些发色团基于紫外可见光谱和荧光光谱的光物理性质。这些生色团观察到具有中等量子效率的深蓝色光致发光和扭曲的分子内电荷转移激发态。进行密度泛函
Palladium-Catalyzed C–S Coupling: Access to Thioethers, Benzo[<i>b</i>]thiophenes, and Thieno[3,2-<i>b</i>]thiophenes
作者:Marius Kuhn、Florian C. Falk、Jan Paradies
DOI:10.1021/ol2016093
日期:2011.8.5
formation/cross-coupling/cyclization domino reaction using thiourea as a cheap and easy to handle dihydrosulfide surrogate has been developed. Structurally important biarylthioether, benzo[b]thiophenes, and thieno[3,2-b]thiophene scaffolds are provided in high yield.
已经开发出了第一个使用硫脲作为便宜且易于处理的二氢硫代用品的C-S键形成/交叉偶联/环化多米诺反应。以高收率提供结构上重要的联芳基硫醚,苯并[ b ]噻吩和噻吩并[3,2- b ]噻吩支架。