Synthesis and application of ligands for the asymmetric addition of organolithium reagents to imines
作者:Catrin A. Jones、Iwan G. Jones、Mushtaq Mulla、Michael North、Lucia Sartori
DOI:10.1039/a702028g
日期:——
Amino acid derived ligands 4d,e are prepared from (S)-valine and (S)-proline respectively, and can be used as chiral ligands during the asymmetricaddition of organolithium reagents to N-arylimines. Ligand 4e, which is prepared by two independent routes, is found to induce addition of organolithium reagents to the si-face of the imines, whilst ligand 4d in common with the previously reported catalysts