1: 46 percent / Et3N / dimethylformamide / 16 h 2: 78 percent / hydrazine hydrate / ethanol / 16 h / Heating 3: acetone / 0.5 h / Heating 4: 82 percent / 0.2N aq. NaOH / 2 h 5: 93 percent / 7N aq. NaOH / dioxane / 6 h / Heating 6: 66 percent / hydrazine hydrate / ethanol / 16 h / Heating 7: 73 percent / Na / liquid ammonia View Scheme