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:
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.
Total synthesis of the cyclic monoterpenoid pyrano[3,2-<i>a</i>]carbazole alkaloids derived from 2-hydroxy-6-methylcarbazole
作者:Cemena Gassner、Ronny Hesse、Arndt W. Schmidt、Hans-Joachim Knölker
DOI:10.1039/c4ob01151a
日期:——
The synthesis of seven pyrano[3,2-a]carbazole alkaloids has been achieved using their putative biogenetic precursor 2-hydroxy-6-methylcarbazole as key intermediate.