Figure 3. Substrate scope of the reaction.

The reactions were carried out with 2 (0.1 mmol, hydrate form), 3a (1.0 equiv.), (R)-1d (10 mol%) and KF (2.0 equiv.) at 20 °C. Isolated yield. ^†Using (S)-1d (10 mol%). *Using (R)-1d (5 mol%). **Using (R)-1d (1 mol%). ^§Using (R)-1d (30 mol%) at 0 °C.