Influence of Phosphoramidites in Copper-Catalyzed Conjugate Borylation Reaction
作者:Cristina Sole、Amadeu Bonet、André H. M. de Vries、Johannes G. de Vries、Laurent Lefort、Henrik Gulyás、Elena Fernández
DOI:10.1021/om300194k
日期:2012.11.26
Copper(I) has become the preferred metal to catalyze the beta-boration of alpha,beta-unsaturated carbonyl compounds, and now we demonstrate that easily accessible monodentate chiral ligands, such as phosphoramidites and phosphites, can be convenient alternative ligands to induce asymmetry in the enantioselective version of this reaction, particularly in the beta-boration of alpha,beta-unsaturated imines.
Enantioselective Catalytic Conjugate Addition of Dialkylzinc Reagents using Copper–Phosphoramidite Complexes; Ligand Variation and Non-linear Effects
作者:Leggy A Arnold、Rosalinde Imbos、Alessandro Mandoli、André H.M de Vries、Robert Naasz、Ben L Feringa
DOI:10.1016/s0040-4020(00)00142-3
日期:2000.4
cyclohexenone and chalcone in order to assess the structural features that are important for stereocontrol. A sterically demanding amine moiety is essential to reach high e.e.’s. Enantioselectivities for chalcones up to 89% and for cyclic enones up to 98% were found. Studies on non-linear effects with the best ligands for both cyclohexenone and chalcone showed clear non-linear effects for both cyclic