Cerium enolates formed from cerium (III) chloride and lithium enolates undergo aldolreaction with ketones or sterically crowded aldehydes to afford the corresponding β-hydroxyketones in high yields.
Lewis Base-Catalyzed Enantioselective Conjugate Reduction of β,β-Disubstituted α,β-Unsaturated Ketones with Trichlorosilane: <i>E</i>/<i>Z</i>-Isomerization, Regioselectivity, and Synthetic Applications
The chiral bisphosphine dioxide-catalyzed asymmetric conjugate reduction of acyclic β,β-disubstituted α,β-unsaturatedketones with trichlorosilane affords saturated ketones having a stereogenic carbon center at the carbonyl β-position with high enantioselectivities. Because the E/Z-isomerizations of enone substrates occur concomitantly, reduction products with the same absolute configurations are obtained