1: 70 percent / 160 °C / 0.5 Torr 2: 72 percent / pyridine / 1.) 0 deg, 4 h, 2.) room temperature, overnight 3: 90 percent / triethyl ammonium iodide / 1.5 h / Heating 4: 90 percent / H2, Et3N / 10percent Pd/C / ethyl acetate / 760 Torr 5: 87 percent / 0.5percent NaOMe / methanol / 24 h / Ambient temperature 6: 80 percent / 92percent aq. hydrazine / ethanol / 0.75 h / Heating View Scheme