1: 1 N hydrochloric acid / 5 h / 70 °C 2: sodium borohydride / tetrahydrofuran; H2O / 0.5 h 3: 1.) triethylamine, phosphoroxychloride, 2.) triethylamine, 3.) potassium carbonate 4: hydrogen, 1 N HCl / 5percent Pd/C / methanol; tetrahydrofuran / 760 Torr / Ambient temperature 5: 84 percent / DMAP / CHCl3 / 16 h / 30 °C View Scheme