sodium hydride in N,N-dimethyl-formamide T=0 - 20°C; 1.5 h;

1.1: phosphorus pentachloride; trichlorophosphate / 3 h / Reflux 2.1: 24 h / 20 °C 3.1: ethanol; potassium / 0.08 h 3.2: 36 h / 20 °C 4.1: AlCl3, aluminium chloride; sodium tetrahydroborate / ethyl acetate; methanol / 4 h / 0 °C 5.1: hydrogen / palladium 10 on activated carbon / methanol / 16 h / 20 °C / 2068.65 Torr 6.1: phosphorus oxytribromide / N,N-dimethyl-formamide / 0.33 h / Reflux 6.2: pH 7 - 8 View Scheme