1: 79 percent / potassium carbonate / acetone / 12 h / 25 °C 2: 1.) LDA / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, hexane, -78 deg C, 7 h View Scheme

lithium diisopropyl amide 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, hexane, -78 deg C, 7 h; Yield given. Multistep reaction;