in diethyl ether; hexane T=20°C;

1: 5 Pd(II)/C(eggshell); hydrogen; acetic acid / ethanol / 12 h / 3102.97 Torr 2: triethylamine / dichloromethane / 0 - 20 °C / Inert atmosphere 3: trichlorophosphate / dichloromethane / 3 h / 120 °C / Inert atmosphere 4: sodium tetrahydroborate / methanol / Inert atmosphere View Scheme

sodium tetrahydroborate in methanol Inert atmosphere;

1: trichlorophosphate / dichloromethane / 3 h / 120 °C / Inert atmosphere 2: sodium tetrahydroborate / methanol / Inert atmosphere View Scheme

1: triethylamine / dichloromethane / 0 - 20 °C / Inert atmosphere 2: trichlorophosphate / dichloromethane / 3 h / 120 °C / Inert atmosphere 3: sodium tetrahydroborate / methanol / Inert atmosphere View Scheme

1.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 20 °C / Inert atmosphere 1.2: 13 h / 20 - 50 °C / Inert atmosphere 2.1: 5 Pd(II)/C(eggshell); hydrogen; acetic acid / ethanol / 12 h / 3102.97 Torr 3.1: triethylamine / dichloromethane / 0 - 20 °C / Inert atmosphere 4.1: trichlorophosphate / dichloromethane / 3 h / 120 °C / Inert atmosphere 5.1: sodium tetrahydroborate / methanol / Inert atmosphere View Scheme