2 h; RefluxAcidic conditions;

1: sulfuric acid 2: lithium aluminium tetrahydride / tetrahydrofuran 3: 1H-imidazole / N,N-dimethyl-formamide 4: 1H-imidazole; iodine; triphenylphosphine / toluene 5: n-butyllithium; N,N,N',N',N'',N''-hexamethylphosphoric triamide / tetrahydrofuran 6: hydrogen; palladium on activated charcoal / ethyl acetate 7: pyridinium chlorochromate / dichloromethane 8: sodium hexamethyldisilazane / tetrahydrofuran 9: tetrabutyl ammonium fluoride / tetrahydrofuran 10: hydrogen; palladium 10 on activated carbon / ethyl acetate View Scheme