1.1: sodium tetrahydroborate / tetrahydrofuran; ethanol / 44 h / -20 °C / Inert atmosphere 2.1: acetonitrile / 1 h / 20 °C / Inert atmosphere 3.1: 4-(N,N-dimethlyamino)pyridine / acetonitrile / 12 h / 0 °C / Inert atmosphere 4.1: camphor-10-sulfonic acid / methanol / 3 h / 0 °C / Inert atmosphere 5.1: Dess-Martin periodane / dichloromethane / 45 h / 20 °C / Inert atmosphere 6.1: n-butyllithium; zinc(II) chloride / tetrahydrofuran; hexane / 5 h / -78 °C / Inert atmosphere 7.1: trifluoroacetic acid / tetrahydrofuran; water / 2 h / 0 - 60 °C / Inert atmosphere 7.2: 0.75 h / 0 °C / Inert atmosphere 8.1: ammonia; sodium / tetrahydrofuran; water; tert-butyl alcohol / 0.08 h / -78 °C / Inert atmosphere 8.2: 14 h / 20 °C / Inert atmosphere 9.1: pyridine; dichlorotriphenylphosphorane / acetonitrile / 3.5 h / 20 °C / Inert atmosphere View Scheme