Valuable substrates for the synthesis of natural products, compounds 3 (R1 =alkyl, aryl, alkoxy; R2 , R3 =alkyl) are formed from β,γ-unsaturated α-keto esters 1 and vinyl ethers 2 by the title reaction [Eq. (1)]. Copper(II) bisoxazolines act as catalysts, and in many cases enantiomeric excesses higher than 99.5 % are achieved.