1: sodium dihydrogenphosphate; sodium chlorite / 2-methyl-but-2-ene; tert-butyl alcohol / 1 h / 0 °C 2: triethylamine / dichloromethane / 0.5 h / -40 °C 3: triethylamine / dichloromethane / 8 h / -40 - 20 °C 4: trifluoroacetic acid; bis-[(trifluoroacetoxy)iodo]benzene / dichloromethane / 9 h / 0 °C 5: lithium aluminium tetrahydride / 1,4-dioxane / 16 h / Reflux 6: carbon tetrabromide; triethylamine; triphenylphosphine / dichloromethane / 16 h / 0 - 20 °C 7: hydrogenchloride; water / tetrahydrofuran / 4 h / 20 °C View Scheme