Copper(II)-Catalyzed Enantioselective Fluorination of β-Keto Esters Using Chiral Spiro Oxazoline Ligands

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Highly enantioselective fluorination of α-alkyl-β-keto esters was performed using a chiral Lewis acid catalyst prepared from Cu(OTf)2 and chiral spiro oxazoline ligands. The fluorination proceeded in a highly enantioselective manner both when cyclic and acyclic substrates were applied to the reaction. Fluorination of α-alkyl­malonates was also performed to afford the corresponding products in good enantioselectivity.