1: 61 percent / N,N-diisopropylethylamine / CH2Cl2 / 4 h / 5 °C 2: 46 percent / triphenylphosphine, diisopropyl azodicarboxylate / benzene / 2 h / Ambient temperature 3: 1) hydrazine monohydrate, 2) triethylamine / 1) MeOH, reflux, overnight, 2) CH2Cl2, r.t., 3 h 4: 100 percent / hydrogen / Pd(OH)2-C / ethanol / 4 h / 760 Torr / Ambient temperature 5: 58 percent / sulfur dioxide / H2O / 48 h / 40 °C 6: 53 percent / hydrogen, barium hydroxide octahydrate / Raney-Ni (W-4) / H2O / 8 h / 760 Torr / Ambient temperature View Scheme