1: 1H-imidazole 2: propionic acid / 110 °C 3: tetrabutyl ammonium fluoride / tetrahydrofuran; dichloromethane / 3 h / 0 °C 4: Dess-Martin periodane / dichloromethane / 2 h / 20 °C 5: sodium dihydrogenphosphate; sodium chlorite / 2-methyl-but-2-ene; tert-butyl alcohol / 1 h / 0 °C 6: triethylamine / dichloromethane / 0.5 h / -40 °C 7: triethylamine / dichloromethane / 8 h / -40 - 20 °C 8: trifluoroacetic acid; bis-[(trifluoroacetoxy)iodo]benzene / dichloromethane / 9 h / 0 °C 9: lithium aluminium tetrahydride / 1,4-dioxane / 16 h / Reflux 10: carbon tetrabromide; triethylamine; triphenylphosphine / dichloromethane / 16 h / 0 - 20 °C 11: hydrogenchloride; water / tetrahydrofuran / 4 h / 20 °C View Scheme