Cleavage of carbon-carbon bonds with high stereochemical control. 6. Asymmetric synthesis of chiral C-centered organosilanes by Haller-Bauer cleavage of optically active, nonenolizable .alpha.-silyl phenyl ketones
The potential of Song’s chiral oligoethylene glycols (oligoEGs) as catalysts was explored in the enantioselective protonation of trimethylsilyl enolethers in combination with alkali metal fluoride (KF and CsF) and in the presence of a proton source. Highly enantioselective protonations of various silylenolethers of α-substituted tetralones were achieved, producing chiral α-substituted tetralones
Stereoselective synthesis of tri- and tetrasubstituted functionalized olefins and newphosphates bearing functionalized cyclic substituent has been developed using thiophosphates and selenophosphates as key intermediates.