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).
A new class of chiral sulfoxideâSchiff base ligands has been developed by the rational combination of two privileged chiral backbones. These sulfoxideâSchiff base ligands were found to be highly efficient for Cu-catalyzed asymmetric Henry reactions (up to 98% yield and 96% ee).