1.1: sodium hydride / tetrahydrofuran; N,N-dimethyl-formamide; mineral oil / 0.5 h / 0 °C / Inert atmosphere 1.2: 0 - 20 °C / Inert atmosphere 2.1: sodium carbonate / hexane / 0.33 h / -40 °C / Inert atmosphere 2.2: 40 h / -40 °C / Inert atmosphere 3.1: water; sodium sulfite / hexane; ethyl acetate / 12 h / 20 °C / Inert atmosphere 4.1: sodium hydride / tetrahydrofuran; N,N-dimethyl-formamide; mineral oil / 0.5 h / 0 °C / Inert atmosphere 4.2: 0 - 20 °C / Inert atmosphere 5.1: hydrogen / methanol; dichloromethane; water / 5 h / 20 °C / Inert atmosphere View Scheme

1.1: sodium hydride / tetrahydrofuran; N,N-dimethyl-formamide; mineral oil / 0.5 h / 0 °C / Inert atmosphere 1.2: 0 - 20 °C / Inert atmosphere 2.1: sodium carbonate / hexane / 0.33 h / -40 °C / Inert atmosphere 2.2: 40 h / -40 °C / Inert atmosphere 3.1: water; sodium sulfite / hexane; ethyl acetate / 12 h / 20 °C / Inert atmosphere 4.1: sodium hydride / tetrahydrofuran; N,N-dimethyl-formamide; mineral oil / 0.5 h / 0 °C / Inert atmosphere 4.2: 0 - 20 °C / Inert atmosphere 5.1: hydrogen / methanol; dichloromethane; water / 5 h / 20 °C / Inert atmosphere 6.1: hydrogenchloride / diethyl ether / 20 °C / Inert atmosphere View Scheme