Table 2.
Reaction conditions: 1 (0.3 mmol), 2a (0.2 mmol), [Rh(COD)Cl]2 (2.5 mol%), rac-BINAP (5 mol%), A3 (50 mol%), DCE (0.4 mL), 80 °C, 15 h. Isolated yields. Regioselectivity ratio (rr) is the ratio of 3 to 4, which is determined by 1H NMR analysis of reaction mixture.
Using Rh(COD)2SbF6 (5.0 mol%) instead of [Rh(COD)Cl]2.