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Reaction conditions: 1a (0.1 mmol), 2a (0.3 mmol), Ni(cod)2 (10 mol%), ligand (11 mol%), iPr2O (0.1 mL), 60 °C, 4 h. Isolated yields. Enantiomeric ratio (er) was determined by HPLC.
Using 2.5 mol% Ni(cod)2 and 2.8 mol% L5, 10 h.
