scheme3

Scheme 3. Substrate scope of aminochalcones 2^a. ^aConditions: 1a (0.10 mmol), 2 (0.15 mmol), and catalyst (0.01 mmol) in CHCl₃ (1.0 mL) at 25 °C; ^bIsolated yield; ^cDetermined by ¹H NMR of the crude reaction mixture; ^dThe ee values were determined by chiral HPLC analysis.