Fig. 2. Substrate scope of reaction. Unless otherwise noted, all the reactions were carried out with 1 (0.2 mmol), (R,R)-QuinoxP* (0.02 mol), CuCl (0.02 mmol), NaOMe (0.02 mmol), tBuOH (0.4 mmol), and B₂pin₂ (0.3 mmol) in toluene (1 mL) at 0 °C for 18 h. The d.r. values (cis/trans) were determined by ¹H NMR of crude reaction mixtures. The enantiomeric excesses were determined by chiral HPLC. ^aThe d.r. value was determined by GC of crude reaction mixtures. ^bThe reaction time was 48 hours.