1: H2 / 10 percent Pd/C / dimethylformamide / 24 h 2: HOBT, EDAC*HCl / dimethylformamide / 3.5 h / Ambient temperature 3: hydrazine hydrate / methanol; CH2Cl2 / 48 h / Ambient temperature 4: CH2Cl2 / 1.5 h / Ambient temperature 5: lithium bis(trimethylsilyl)amide / tetrahydrofuran / 30 h / Ambient temperature 6: TFA / CH2Cl2 / 1 h / Ambient temperature 7: 92 percent / EDAC / CH2Cl2 / 2 h / 0 °C 8: 95 percent / 1.0 N NaOH / methanol / 5.5 h View Scheme