lithium diisopropyl amide 1) THF, hexanes, -78 deg C, 2) -19 to -15 deg C; Yield given. Multistep reaction;

1: 1) KHMDS / 1) THF, -78 deg C, 30 min, 2) -78 deg C to room temperature, 36 h 2: NaBH4 / ethanol / 0 deg C to room temperature, overnight 3: methanesulfonic acid / toluene / 20 h / Heating View Scheme

1: 1) KHMDS / 1) THF, -78 deg C, 30 min, 2) -78 deg C to room temperature, 36 h 2: NaBH4 / ethanol / 0 deg C to room temperature, overnight View Scheme