1: 78 percent / HCl / H2O / 5 h / 75 °C 2: 90 percent / TEA / CH2Cl2 / 2 h / 20 °C 3: 9.8 g / H2 / Pd/C / ethyl acetate; methanol / 3 h / 20 °C 4: 75 percent / K2CO3 / acetone / 5 h / Heating 5: 91 percent / NaN3 / dimethylformamide / 3 h / 90 °C 6: 88 percent / hydrazine hydrate / PdO / methanol / 2 h / Heating View Scheme