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.