A Highly Versatile Catalyst System for the Cross-Coupling of Aryl Chlorides and Amines
作者:Rylan J. Lundgren、Antonia Sappong-Kumankumah、Mark Stradiotto
DOI:10.1002/chem.200902316
日期:2010.2.8
air‐stable P,N ligands enable the cross‐coupling of aryl and heteroaryl chlorides, including those bearing as substituents enolizable ketones, ethers, esters, carboxylic acids, phenols, alcohols, olefins, amides, and halogens, to a diverse range of amine and related substrates that includes primary alkyl‐ and arylamines, cyclic and acyclic secondary amines, NH imines, hydrazones, lithium amide, and ammonia
[Ir(COD)Cl]<sub>2</sub> as a Catalyst Precursor for the Intramolecular Hydroamination of Unactivated Alkenes with Primary Amines and Secondary Alkyl- or Arylamines: A Combined Catalytic, Mechanistic, and Computational Investigation
作者:Kevin D. Hesp、Sven Tobisch、Mark Stradiotto
DOI:10.1021/ja908316n
日期:2010.1.13
scrutinized computationally. An energetically demanding oxidative addition of the amine N-H bond to the Ir(I) center precludes the latter mechanism and instead activation of the olefin C=C bond prevails, with [Ir(COD)Cl(substrate)] M1 representing the catalytically competent compound. Notably, such an olefin activation mechanism had not previously been documented for Ir-catalyzed alkene hydroamination. The
Unusual NHC–Iridium(I) Complexes and Their Use in the Intramolecular Hydroamination of Unactivated Aminoalkenes
作者:Gellért Sipos、Arnold Ou、Brian W. Skelton、Laura Falivene、Luigi Cavallo、Reto Dorta
DOI:10.1002/chem.201600378
日期:2016.5.10
N‐heterocycliccarbene (NHC) ligands with naphthyl side chains were employed for the synthesis of unsaturated, yet isolable [(NHC)Ir(cod)]+ (cod=1,5‐cyclooctadiene) complexes. These compounds are stabilised by an interaction of the aromatic wingtip that leads to a sideways tilt of the NHC−Ir bond. Detailed studies show how the tilting of such N‐heterocycliccarbenes affects the electronic shielding
具有萘基侧链的N-杂环卡宾(NHC)配体用于合成不饱和但可分离的[(NHC)Ir(cod)] +(cod = 1,5-环辛二烯)配合物。这些化合物通过芳族翼尖的相互作用而稳定,从而导致NHC-Ir键的侧向倾斜。详细的研究表明,此类N杂环卡宾的倾斜如何影响卡宾碳原子的电子屏蔽性能,以及13 C NMR信号中的明显高场位移如何反映出这种情况。当用于分子内加氢胺化时,这些[(NHC)Ir(cod)] +在温和的反应条件下,这些物种显示出很高的催化活性。对映体纯的催化剂体系可产生具有出色对映选择性的吡咯烷。
NOVEL CATALYSTS
申请人:Lundgren Rylan J.
公开号:US20130253185A1
公开(公告)日:2013-09-26
The present invention provides novel compounds and ligands that are useful in transition metal catalyzed cross-coupling reactions. For example, the compounds and ligands of the present invention are useful in palladium or gold catalyzed cross-coupling reactions.
Air- and Water-Stable Catalysts for Hydroamination/Cyclization. Synthesis and Application of CCC−NHC Pincer Complexes of Rh and Ir
作者:Eike B. Bauer、G. T. Senthil Andavan、T. Keith Hollis、Ramel J. Rubio、Joon Cho、Glenn R. Kuchenbeiser、Theodore R. Helgert、Christopher S. Letko、Fook S. Tham
DOI:10.1021/ol8000766
日期:2008.3.1
The scope of CCC-NHC pincer complex synthetic methodology by metalation/transmetalation has been extended to Ir. Structural characterization revealed that it is isomorphous with the Rh complex. Both Rh and Ir complexes are efficient catalysts for the hydroamination/cyclization of secondary amines in the presence of air and/or water.