1: tetrahydrofuran / 0.08 h / 20 °C 2: 1.) LDA / 1.) THF, -20 deg C, 55 min, 2.) from -78 deg C to 20 deg C, 8 h View Scheme

lithium diisopropyl amide 1.) THF, -20 deg C, 55 min, 2.) from -78 deg C to 20 deg C, 8 h; Yield given. Multistep reaction;