1: 1.) n-BuLi / 1.) THF, hexane, -78 deg C, 15 min, 2.) THF, hexane, a) from -78 deg C to 0 deg C, 2.5 h, b) RT, 0.5 h 2: 87 percent / formic acid / 1.5 h / 80 °C View Scheme

1: 1.) n-BuLi / 1.) THF, hexane, -78 deg C, 15 min, 2.) THF, hexane, a) from -78 deg C to 0 deg C, 2.5 h, b) RT, 0.5 h 2: 95 percent / formic acid / 1.5 h / 80 °C View Scheme