1.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 1 h / Cooling with ice; Inert atmosphere 1.2: 5 h / 20 °C 2.1: borane-THF / tetrahydrofuran / 15 h / 0 - 20 °C / Inert atmosphere 2.2: 3 h / Reflux 3.1: triethylamine / dichloromethane / 1 h / 0 °C 3.2: 15 h / 20 °C 4.1: hydrogen; acetic acid / palladium on carbon / 4 h / 40 °C 5.1: [bis(2-methoxyethyl)amino]-sulfur trifluoride / dichloromethane / 8 h / 20 °C / Reflux 6.1: borane-THF / tetrahydrofuran / 15 h / 0 - 20 °C / Inert atmosphere 6.2: 3 h / Reflux View Scheme