Aminosulf(ox)ides as Ligands for Iridium(I)-Catalyzed Asymmetric Transfer Hydrogenation
作者:Daniëlle G. I. Petra、Paul C. J. Kamer、Anthony L. Spek、Hans E. Schoemaker、Piet W. N. M. van Leeuwen
DOI:10.1021/jo991700t
日期:2000.5.1
series of chiral N,S-chelates (6-22) was synthesized to serve as ligands in the iridium(I)-catalyzed reduction of ketones. Both formic acid and 2-propanol proved to be suitable as hydrogen donors. Sulfoxidation of an (R)-cysteine-based aminosulfide provided a diastereomeric ligand family containing a chiral sulfur atom. The two chiral centers of these ligands showed a clear effect of chiral cooperativity
Development of a novel phosphoramidite-selenide ligand for Pd-catalyzed asymmetric allylic substitution
作者:Bin Feng、Pei-Wen Fang、Gui-Man Lan、Li-Yan Peng、Lu-Fang Liang、Ge-Yun You
DOI:10.1039/d2ob01249a
日期:——
A novel chiral P,Se-heterodonor ligand has been designed and prepared through an efficient and simple operation. This ligand can be successfully applied to Pd-catalyzed asymmetricallylicsubstitution with C- and N-nucleophiles, producing a diverse range of chiral allylic products in high yields and enantioselectivities (up to 99% yield and 95% ee).