An enantioselective aldol reaction between ketones and ketene silyl acetals is described using CuF-chiral phosphine as a catalyst. The key for high enantioselectivity was the development of a novel ligand derived from Taniaphos combined with the unique accelerative effect of PhBF3K. These conditions are applicable to various substrates such as aromatic, aliphatic, and heteroaromatic ketones. In the
Newchiral bidentate diphenylphospholanes were designed targeting a catalytic enantioselectivealdolreaction to ketones. Ligands 5l and 5m having cis-2-butenyl and cyclopropyl groups at the linker part, respectively, were identified as effective chiral ligands for a CuF-catalyzed enantioselectivealdolreaction to ketones. Catalysts prepared from CuF·3PPh3·2EtOH and these ligands produced ketone aldol