1: tetrafluoroboric acid diethyl ether complex / 1,2-dichloro-ethane / 40 - 90 °C / Inert atmosphere 2: 10 palladium on activated carbon; hydrogen / tetrahydrofuran / 3 h / 20 °C / 750.08 Torr 3: iodine; sodium hydrogencarbonate / ethanol; water / 20 °C / Inert atmosphere 4: trifluorormethanesulfonic acid; acetic anhydride; acetic acid / 1 h / 20 °C / Inert atmosphere 5: sodium tetrahydroborate / methanol; dichloromethane / 1.33 h / 20 °C / Inert atmosphere View Scheme