Palladium catalyzed asymmetric hydrophosphination of α,β- and α,β,γ,δ-unsaturated malonate esters – efficient control of reactivity, stereo- and regio-selectivity
作者:Xiang-Yuan Yang、Jun Hao Gan、Yongxin Li、Sumod A. Pullarkat、Pak-Hing Leung
DOI:10.1039/c4dt02673j
日期:——
the asymmetric P–H addition reaction involving activated olefins. Our studies on the asymmetric P–H addition of diphenylphosphine to malonate ester and α,β,γ,δ-alkylidenemalonate ester revealed for the first time that the catalyst choice can have a dramatic impact in terms of reactivity as well as regio- and stereo-control for this asymmetric hydrofunctionalization reaction. Besides showing significantly
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.
Direct Synthesis of Chiral Tertiary Diphosphines <i>via</i> Pd(II)-Catalyzed Asymmetric Hydrophosphination of Dienones
作者:Yinhua Huang、Renta Jonathan Chew、Yongxin Li、Sumod A. Pullarkat、Pak-Hing Leung
DOI:10.1021/ol202480r
日期:2011.11.4
A highly diastereo- and enantioselective Pd(II)-catalyzed hydrophosphination of dienones with Ph2PH involving formation of double C*-P bonds has been developed, providing a series of chiral tertiary diphosphines (chiral PCP pincer ligands) in high yields. A catalytic cycle for the reaction was proposed.
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