<i>t</i>-Bu-QuinoxP* Ligand: Applications in Asymmetric Pd-Catalyzed Allylic Substitution and Ru-Catalyzed Hydrogenation
作者:Tsuneo Imamoto、Miwako Nishimura、Aya Koide、Kazuhiro Yoshida
DOI:10.1021/jo071192k
日期:2007.9.1
[GRAPHICS]The potential of the t-Bu-QuinoxP* ligand (1) as a chiral ligand in asymmetric synthesis was examined. The ligand exhibited good to excellent asymmetric induction in Pd-catalyzed asymmetric allylic substitution of 1,3-diphenyl-2propenyl acetate (up to 98.7% ee) and in Ru-catalyzed asymmetric hydrogenation of ketones (up to 99.9% ee).
A Pd-catalyzed asymmetric allylic amination using aspartic acid derived P-chirogenic diaminophosphine oxides (DIAPHOXs) is described. Asymmetric allylic amination of both linear and cyclic substrates proceeded at room temperature to give the chiral allylic amines in 72-99% ee.