[EN] NOVEL BETA-HYDROXYKETONES AND BETA-ALKOXYKETONES WITH ESTROGENIC ACTIVITY [FR] NOUVELLES BÊTA-HYDROXYCÉTONES ET BÊTA-ALCOXYCÉTONES PRÉSENTANT UNE ACTIVITÉ OESTROGÉNIQUE
The novel chiral diaqua palladium(II) complexes of (R)-BINAP 9a and (R)-Tol-BINAP 9b were prepared in good yield, and their structures were determined by X-ray crystallography. These air- and moisture-stable complexes were found to be excellent catalysts for the asymmetric aldol reaction, and up to 89% ee of asymmetric induction was achieved using these catalysts.
Chiral Bipyridine Ligand with Flexible Molecular Recognition Site: Development and Application to Copper‐Catalyzed Asymmetric Borylation of α,β‐Unsaturated Ketones
Asymmetric Catalysis: A novel chiral bipyridine ligand with a flexible hydrogen-bond donor was developed based on the TS-stabilization concept. This designed chiral bipyridine ligand was applied to the copper-catalyzed asymmetric borylation of a wide range of α,β-unsaturated ketones, affording the borylated products in high yields with high enantioselectivities. The potential of a high-level control
Dicationic ((−)-sparteine)palladium-catalyzed enantioselective aldol reaction of aldehydes with 1-phenyl-1-trimethylsilyloxyethene, proceeding via a palladium enolate
A dicationic ((−)-sparteine)palladium complex underwent a superior catalytic enantioselective aldol reaction of aldehydes with 1-phenyl-1-trimethylsilyloxyethene performing satisfactorily, starting with ((−)-sparteine)PdCl2 and AgSbF6 as catalyst precursors (1 mol % loading) in the presence of 3 Å molecular sieves over the reaction.
The dicationic ((R)-BINAP)palladium-catalyzed enantioselectivealdolreaction of benzaldehyde with 1-phenyl-1-trimethylsilylethene has been reinvestigated regarding the reaction conditions in the presence of ((R)-BINAP)palladium chloride and AgSbF6 with 3 Å molecular sieves. The simplified practical procedure with 1 mol % catalyst loading realized the high performance of 98% yield and 76% ee with reliable