The scope of the reaction with respect to both substrates^a.

^aReaction conditions: 1 (0.05 mmol), 2 (0.06 mmol) and (S)-4.1i (10 mol%) using 4 Å MS in DCE (0.5 mL) at room temperature for 12 h. Isolated yields. The ee values of 3 were determined by HPLC analysis with a chiral stationary phase.