1: 13.8 g / Et2O*BF3 / 96 h / Ambient temperature 2: W-7 Raney Ni / ethanol / 5 h / Heating 3: Et2O*BF3 / 5 h / Ambient temperature 4: Raney Ni / ethanol / 5 h / Heating 5: 400 mg / aq. NaHCO3 / methanol / 3 h / Heating 6: 150 mg / NaBH4 / methanol / 3 h / Ambient temperature 7: 60 mg / POCl3 / pyridine; ethanol / 19 h / 0 °C / Heating View Scheme

With  alkali