1: 87 percent / AcOH / 13 h / 49 °C 2: 71 percent / H2 / 10percent Pd/C / ethyl acetate / 40 h / 22 °C 3: 80.5 percent / acetic acid; tetrahydrofuran / 3 h / 20 °C 4: 32.1 percent / aq. HCl / dioxane / 51 h / 41 - 43 °C 5: 85 percent / methanol; diethyl ether / 0 - 5 °C 6: 84 percent / LiEt3BH / tetrahydrofuran / 1 h / -78 °C 7: ZnCl2, 4 Angstroem molecular sieves / tetrahydrofuran / 2.5 h / Heating View Scheme