1: 1.) Mg / 1.) Et2O, 2.) Et2O/THF, 40 deg C, 2 h. 2: 70 percent / 48percent H2SO4 / tetrahydrofuran / 10 h / Ambient temperature 3: 85percent hydrazine hydrate / butan-1-ol / Heating 4: O2, CuCl / pyridine 5: acetic acid / 10 h / 50 °C 6: H2 / P-2 Ni View Scheme

1: 1.) Mg / 1.) Et2O, 2.) Et2O/THF, 40 deg C, 2 h. 2: 70 percent / 48percent H2SO4 / tetrahydrofuran / 10 h / Ambient temperature 3: 85percent hydrazine hydrate / butan-1-ol / Heating 4: O2, CuCl / pyridine View Scheme