1: 61 percent / diphenyl carbonate, NaHCO3 / dimethylformamide / 0.17 h / 150 °C 2: 92 percent / dimethylformamide; ethyl acetate / 5 h / 120 °C 3: H2, NaOAc / 1percent Pd/C / methanol; H2O 4: 20percent methanolic NH3 / 5 °C View Scheme