1: 69 percent / NaH; BuLi / tetrahydrofuran; hexamethylphosphoric acid triamide; hexane / 1 h / 20 °C 2: 73 percent / NaBH4 / methanol / 2 h / -30 - -25 °C 3: 82 percent / KOH / methanol; H2O View Scheme