Synthesis of Diastereomeric 1,4-Diphosphine Ligands Bearing Imidazolidin-2-one Backbone and Their Application in Rh(I)-Catalyzed Asymmetric Hydrogenation of Functionalized Olefins
作者:Yong?Jian Zhang、Kee?Yong Kim、Jung?Hwan Park、Choong?Eui Song、Kyungae Lee、Myoung?Soo Lah、Sang-gi Lee
DOI:10.1002/adsc.200404286
日期:2005.3
The diastereomeric1,4-diphosphineligands, (S,S,S,S)-1a, (R,S,S,R)-1b and (R,S,S,S)-1c, with the imidazolidin-2-onebackbone were synthesized, and utilized for an investigation of the effects of backbone chirality on the enantioselectivity in the Rh(I)-catalyzedhydrogenation of various functionalized olefinic substrates. It was found that the catalytic efficiencies are largely dependent on the configurations