application of binaphthyl-stabilized palladium nanoparticles (Bin-PdNPs) with chiral modifiers in asymmetric hydrogenation of N-heteroaromatics is revealed. With an appropriate ratio of R-BINAP/Bin-PdNPs used, the pre-prepared chiral nanocatalyst achieves asymmetric hydrogenations of 2-substituted quinolines with good to excellent yields and moderate enantioselectivities, which showed superior catalytic properties
We have developed a highly efficient and practical strategy for the kinetic resolution of indoline derivatives, involving a chiral Brønstedacid-catalyzed iminium ion formation and asymmetric transfer hydrogenation cascade process. The kinetic resolution allows the synthesis of 2-substituted N-benzylindolines in good yields with moderate to excellent enantioselectivities.
Kinetic Resolution of Indolines by Pd-Catalyzed Asymmetric Allylic Amination
作者:Xue Long Hou、Bao Hui Zheng
DOI:10.1021/ol9002543
日期:2009.4.16
The kinetic resolution of indolines was realized via a Pd-catalyzed allylic substitution reaction by using Trost's chiral ligand L10, affording optically active indolines and N-allylated indolines in high yields and high enantioselectivities with an S factor up to 59, which provided the first example for the kinetic resolution of nucleophiles via a transition-metal-catalyzed allylic substitution reaction.