1: 85.5 percent / H2 / Pd/CaCO3 / methanol / 1 h 2: 18 percent / H2N-NH2*H2O / methanol; H2O / 48 h / Ambient temperature 3: 94 percent / K-OCMe3 / dioxane; methanol / Ambient temperature 4: 85 percent / CH2Cl2 / 3.5 h / Irradiation View Scheme