1: 1.) NaBH4 / 1.) ethanol, room temperature, 30 min 2: 1.) lithium diisopropylamide / 1.) THF, -78 deg C, 30 min, 2.) -78 deg C up to room temperature View Scheme

lithium diisopropyl amide 1.) THF, -78 deg C, 30 min, 2.) -78 deg C up to room temperature; Yield given. Multistep reaction;