1: 1.) n-BuLi, diisopropylamine, HMPA / 1.) THF, hexane, -78 deg C, 10 min, 2.) THF, hexane, a) -78 deg C, b) -40 deg C 2: 95 percent / methanol 3: 90 percent / BF3*Et2O, H2O / methanol / 60 - 70 °C View Scheme