1.1: sodium tetrahydroborate / methanol / 1.25 h / 0 - 20 °C 2.1: phosphorus tribromide / dichloromethane / 20 °C 3.1: sodium hydride / N,N-dimethyl-formamide / 0.5 h / -10 - -5 °C 3.2: 3 h / -5 - 0 °C 4.1: toluene / 12 h / 70 - 75 °C 5.1: hydrogen / palladium-on-charcoal / ethyl acetate / 30 - 35 °C / 2942.29 - 3677.86 Torr View Scheme

1.1: sodium tetrahydroborate / methanol / 1.25 h / 0 - 20 °C 2.1: phosphorus tribromide / dichloromethane / 20 °C 3.1: sodium hydride / N,N-dimethyl-formamide / 0.5 h / -10 - -5 °C 3.2: 3 h / -5 - 0 °C 4.1: toluene / 12 h / 70 - 75 °C View Scheme