1: 87 percent / Huenig's base / CH2Cl2 / 12 h 2: 90 percent / LAH / tetrahydrofuran / 48 h / 60 °C 3: 100 percent / NaIO4; SiO2 / CH2Cl2 / 2 h / 20 °C 4: 87 percent / NaBH4 / methanol / 2 h / -40 °C 5: 92 percent / HCl / methanol / 10 h / 20 °C View Scheme