1: Zn, aq. AcOH / 2 h / 40 °C 2: H2O, Na2CO3 / tetrahydrofuran / 2 h / Ambient temperature 3: OsO4, NaIO4 / H2O; tetrahydrofuran / 0.67 h / Ambient temperature 4: H2 / Pd/C / methanol / 12 h / 2120.3 Torr View Scheme