1: 92 percent / H2, AcONa / 10percent Pd/C / tetrahydrofuran / 24 h / Ambient temperature 2: 80percent aq. acetic acid / 8 h / 50 °C 3: aq. NaIO4, SiO2 / CH2Cl2 / 0.25 h 4: 1.8 g / NaBH4 / methanol / 2 h / -30 - 0 °C View Scheme