C. Jimeno et al., Highly enantioselective addition of diethylzinc to diphenylphosphinoyl imines under dual amino alcohol/halosilane mediation, ORG LETT, 2(20), 2000, pp. 3157-3159
[GRAPHICS]
Arylethylene derived, enantiomerically pure amino alcohols have been evalua
ted as ligands for the dual-catalyzed (amino alcohol/halosilane) enantiosel
ective addition of diethylzinc to diphenylphosphinoyl imines. Among them, t
he conformationally restricted g-fluorenone derived ligand 4c provides the
highest enantioselectivities so far reported over a range of substrate imin
es.