1: 80 percent / IBX / dimethylsulfoxide / 4 h / 20 °C 2: 81 percent / Ba(OH)2*8H2O / tetrahydrofuran; H2O / 5 h / 20 °C 3: 80 percent / HF*Py / tetrahydrofuran / 4 h / Heating 4: 70 percent / H2; HCl / Pd/C / ethanol; ethyl acetate; H2O / 10 h View Scheme