Triaminophosphine ligands for carbon-nitrogen and carbon-carbon bond formation
申请人:Iowa State University Research Foundation, Inc.
公开号:US07385058B1
公开(公告)日:2008-06-10
Methods and compounds are provided for the formation of carbon-nitrogen or carbon-carbon bonds comprising reacting an amine or an aryl boronic acid with an aryl halide in the presence of a palladium catalyst, a base, and a compound of formula II:
A photochemical C–N coupling of aryl halides with nitroarenes is demonstrated for the first time. Catalyzed by a NiII complex in the absence of any external photosensitizer, readily available nitroarenes undergo coupling with a variety of aryl halides, providing a step‐economic extension to the widely used Buchwald–Hartwig C–N couplingreaction. The method tolerates coupling partners with steric‐congestion
首次证明了芳基卤化物与硝基芳烃的光化学C–N偶联。在没有任何外部光敏剂的情况下,通过Ni II络合物的催化,易得的硝基芳烃与各种芳基卤化物偶合,为广泛使用的Buchwald-Hartwig C-N偶合反应提供了经济上的扩展。该方法耐受具有对碱基和亲核试剂敏感的空间拥塞和官能团的偶联伴侣。机理研究表明,该反应是通过将由Ni I / Ni III循环生成的芳基加至亚硝基芳烃中间体而进行的。
Application of a New Bicyclic Triaminophosphine Ligand in Pd-Catalyzed Buchwald−Hartwig Amination Reactions of Aryl Chlorides, Bromides, and Iodides
作者:Sameer Urgaonkar、Ju-Hua Xu、John G. Verkade
DOI:10.1021/jo034994y
日期:2003.10.1
The new bicyclic triaminophosphine ligand P(i-BuNCH2)3CMe (3) has been synthesized in three steps from commercially available materials and its efficacy in palladium-catalyzed reactions of aryl halides with an array of amines has been demonstrated. Electron-poor, electron-neutral, and electron-rich aryl bromides, chlorides, and iodides participated in the process. The reactions encompassed aromatic
新的双环三氨基膦配体P(i-BuNCH2)3CMe(3)由市售材料分三步合成,并已证明其在钯催化的芳基卤化物与一系列胺反应中的功效。贫电子,中性电子和富电子芳基溴化物,氯化物和碘化物参与了该过程。反应包括芳族胺(伯或仲)和仲胺(环或无环)。还显示出弱碱Cs 2 CO 3可以与配体3一起使用,从而允许在我们的胺化方案中使用多种官能化的底物(例如,那些含有酯和硝基的底物)。该配体为芳基碘化物的胺化提供了一种非常普通,有效和温和的钯催化剂。尽管3对空气和湿气比较敏感,可以采用简单的程序来避免使用手套箱。比较3在这些反应中与前氮杂磷杂环戊烷P(i-BuNCH2CH2)3N的功效(2)显示,除了2中有转环的机会(但3中没有),这两者之间还存在其他明显的立体电子对比有助于解释Pd / 2和Pd / 3催化体系活性差异的配体。
A Tuned Bicyclic Proazaphosphatrane for Catalytically Enhanced<i>N</i>-Arylation Reactions with Aryl Chlorides
作者:So Han Kim、Min Kim、John G. Verkade、Youngjo Kim
DOI:10.1002/ejoc.201403428
日期:2015.3
The N-arylation of various amines with arylchlorides proceeded in good-to-excellent yields in the presence of P[N(p-NMe2)C6H4CH2}CH2CH2]3N (1e, a new electron-rich proazaphosphatrane ligand) and small amounts of Pd2(dba)3 (dba = dibenzylideneacetone). This catalytic system was also very effective for the synthesis of carbazoles.
作者:Kevin W. Anderson、Maria Mendez-Perez、Julian Priego、Stephen L. Buchwald
DOI:10.1021/jo034962a
日期:2003.12.1
detailed study of the palladium-catalyzedamination of aryl nonaflates is reported. Use of ligands 2-4 and 6 allows for the catalytic amination of electron-rich and -neutral aryl nonaflates with both primary and secondary amines. With use of Xantphos 5, the catalytic amination of a variety of functionalized aryl nonaflates resulted in excellent yields of anilines; even 2-carboxymethyl aryl nonaflate is effectively