1: p-toluenesulfonic acid / toluene / 2 h / Ambient temperature 2: 96 percent / conc. H2SO4, H2 / 10percent Pd/C / tetrahydrofuran / 6 h / 45 °C / 3750.3 Torr 3: 95 percent / CH2Cl2 / 6 h / Ambient temperature 4: 91 percent / conc. HCl / methanol / 2 h / 45 °C View Scheme