Enantioselective Hydrophosphination of Enones with Diphenylphosphine Catalyzed by Bis(imidazoline) NCN Pincer Palladium(II) Complexes
作者:Xin-Qi Hao、Yong-Wei Zhao、Jing-Jing Yang、Jun-Long Niu、Jun-Fang Gong、Mao-Ping Song
DOI:10.1021/om500144b
日期:2014.4.14
chiral NCN pincer Pd(II) complexes with 1,3-bis(2′-imidazolinyl)phenyl (Phebim) ligands were synthesized via the C–H activation or oxidative addition method. A dinuclear macrocyclic Pd(II) complex was also prepared by reaction of the Phebim-H ligand with PdCl2. All of the new compounds were fully characterized, and X-ray single-crystal structures were obtained for two of the complexes. The Pd(II) complexes
Catalytic asymmetric synthesis of Pt- and Pd-PCP pincer complexes bearing a para-N pyridinyl backbone
作者:Esther Hui Yen Wong、Yu-Xiang Jia、Yongxin Li、Sumod A. Pullarkat、Pak-Hing Leung
DOI:10.1016/j.jorganchem.2018.03.010
日期:2018.5
A diastereoselective catalytic asymmetric hydrophosphination reaction was performed using a palladacycle catalyst to produce chiral PCP phosphine ligand with high dr (95:5) and excellent enantioselectivity (>99% ee). Subsequent facile metalation of the chiral ligand with Pt and Pd metal salts yielded the desired pincercomplexes. The protonated form of these pincercomplexes was also synthesised, and
Versatile Syntheses of Optically Pure PCE Pincer Ligands: Facile Modifications of the Pendant Arms and Ligand Backbones
作者:Xiang-Yuan Yang、Wee Shan Tay、Yongxin Li、Sumod A. Pullarkat、Pak-Hing Leung
DOI:10.1021/acs.organomet.5b00132
日期:2015.4.27
one-pot synthetic procedure was used efficiently to prepare the corresponding optically pure pincer complexes. All the new complexes were characterized by NMR and mass spectroscopy. The molecular structures of several selected complexes have also been elucidated by X-ray crystallography. Preliminary studies indicated that minor structural changes on these novel pincer complexes affect their chemical
NHC–copper-catalyzed asymmetric 1,4-addition of diarylphosphines to α,β-unsaturated ketones
作者:Yun-Rong Chen、Jian-Jun Feng、Wei-Liang Duan
DOI:10.1016/j.tetlet.2013.10.158
日期:2014.1
N-Heterocyclic carbene–copper-catalyzed asymmetric1,4-addition of diarylphosphines to α,β-unsaturated ketones was developed for the synthesis of chiral phosphorus derivatives in high yields with moderate enantioselectivity under mild conditions.
Systematic X-ray analysis, 13C NMR spectroscopy and computational studies revealed the existence of Pt → C(aryl) π* back donation in P–C–P platinum(ii) pincer complexes.