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