1: 66 percent / NaH / 1,2-dimethoxy-ethane / 1 h / Ambient temperature 2: 81 percent / NaH / 0.5 h / 120 °C 3: 1) 1.2M BCl3, 2) NH3 / 1) CH2Cl2, -78 deg C, 3 h, 2) MeOH View Scheme