1: 1.) butyllithium / 1.) Et2O, 2.) -78 deg C, 10 min 2: 83 percent / 60percent HClO4 / tetrahydrofuran / 5 h / 70 °C 3: diethyl ether / 1.5 h / 0 °C 4: 17 percent / N-bromosuccinimide / aq. acetic acid / 1 h / 25 °C 5: 1.) H2, 2.) potassium carbonate / 1.) 5percent Pd-C / 1.) acetone 6: 80 percent / copper(II) nitrate / acetic anhydride / -20 °C View Scheme