Looking for a Synergic Effect between NHCs and Chiral P-Ligands
摘要:
The issue of the added value of NHCs in asymmetric catalysis with respect to trusted chiral P-ligands was addressed: considering a prototypical asymmetric allylic alkylation reaction as a model, the association of a priori inhibiting and achiral NHCs with modular P-ligand resulted in enhancement of er up to 508% and increased rates.
Looking for a Synergic Effect between NHCs and Chiral P-Ligands
作者:Nicolas Toselli、David Martin、Gérard Buono
DOI:10.1021/ol800225t
日期:2008.4.1
The issue of the added value of NHCs in asymmetric catalysis with respect to trusted chiral P-ligands was addressed: considering a prototypical asymmetric allylic alkylation reaction as a model, the association of a priori inhibiting and achiral NHCs with modular P-ligand resulted in enhancement of er up to 508% and increased rates.
Scope and Limitations of the Aromatic Anionic [1,3] P–O to P–C Rearrangement in the Synthesis of Chiral o -Hydroxyaryl Diazaphosphonamides
作者:Olivier Legrand、Jean Michel Brunel、Gérard Buono
DOI:10.1016/s0040-4020(99)00966-7
日期:2000.1
[1,3] P–O to P–Crearrangement in the synthesis of chiral o-hydroxyaryl diazaphosphonamides has been envisaged. Various strong bases such as LDA, sec-BuLi, tert-BuLi have been conveniently used. The scope of the regioselectivity of the rearrangement has been particularly studied varying the nature of the phenoxy group implied in this reaction. A totallydiastereoselectiveP–O to P–Cmigration rearrangement