1.1: tetrahydrofuran / -78 °C 2.1: NaH / tetrahydrofuran / 20 °C 3.1: O3; NaOH / CH2Cl2 / -78 °C 4.1: HCl / methanol / 20 °C 5.1: 75 percent / Zn(BH4)2 / tetrahydrofuran / -78 °C 6.1: NaHCO3 / methanol / 0 °C 7.1: SOCl2 / CH2Cl2 / Heating 8.1: HCl / H2O; methanol / Heating 8.2: NaHCO3 / H2O; methanol / 50 °C View Scheme