1: diisobutylaluminium hydride / CH2Cl2 / 0.08 h / -78 °C 2: pyridinium chlorochromate / CH2Cl2 / 2.5 h / Ambient temperature 3: 83 percent / 48percent aq. HF / acetonitrile / 2 h / Ambient temperature View Scheme

1: diisobutylaluminium hydride / CH2Cl2 / 0.08 h / -78 °C 2: pyridinium chlorochromate / CH2Cl2 / 2.5 h / Ambient temperature 3: 83 percent / 48percent aq. HF / acetonitrile / 2 h / Ambient temperature 4: 85 percent / pyridine / 4 h / Ambient temperature 5: t-BuOK / tetrahydrofuran 6: 100 percent / LiOH / propan-2-ol; H2O View Scheme