1: 78 percent / H2NNH2*H2O / CH2Cl2; methanol / 5 h / 60 °C 2: 41 percent / triethylamine / CH2Cl2 / 0.33 h / -30 °C 3: 1) AgNO3, pyridine, 2) H2S / 1) MeOH, CH2Cl2, H2O, room temperature, 10 min 4: diisopropylethylamine / acetonitrile / 4.5 h 5: 72 percent / AlCl3, anisole / CH2Cl2 / 1.5 h / -30 °C View Scheme