1: LiAlH4 / tetrahydrofuran / 0.5 h / 20 °C 2: pyridine / 1 h / 0 °C 3: 1,3-dibromo-5,5-dimethyl-imidazolidine-2,4-dione / benzene; hexane / 0.5 h / 70 °C 4: 2,4,6-trimethylpyridine / toluene / 2 h / Heating 5: tetrabutylammonium fluoride / tetrahydrofuran / 1 h / 20 °C 6: 72 percent / pyridine; 4-(dimethylamino)pyridine / 2 h / 50 °C 7: 100 percent / Li2CuCl3 / tetrahydrofuran / -30 - 20 °C 8: 69 percent / H2SO4 / dioxane / 70 h / Heating View Scheme