1: 77 percent / NaH / hexamethylphosphoric acid triamide / 0 deg C, 1 h; room temperature, 16 h 3: 75 percent / toluene / 40 h / 130 °C 4: tetrabutylammonium fluoride / tetrahydrofuran / 1 h / Ambient temperature 5: Jones' reagent / acetone / 0.33 h / 0 °C View Scheme