1: 5.01 g / Dess-Martin periodinane, AcOH / CH2Cl2 / 1.17 h / Ambient temperature 2: 2) NaBH3CN / 1) DMF, 0 deg C, 5 min, 2) DMF, 0 deg C, 1 h 3: 98 percent / aq. 1 M HCl / tetrahydrofuran / 2.5 h / 58 °C 4: 91 percent / hydrogen / 10percent Pd-C / dimethylformamide; aq. HCl / 25 h / 2327.2 Torr View Scheme