1: HF, pyridine, t-BuONO / 2 h / -30 °C 2: 2.5 g / pyridine / 15 h / Ambient temperature 3: 84 percent / dimethylformamide / 24 h / Ambient temperature 4: 73 percent / DBU, pyridine / 15 h / Ambient temperature View Scheme

1: pyridine / 0.5 h 2: pyridine / dioxane / 2.25 h 3: pyridine/H2O / dioxane / 0.25 h 4: 67 percent / pyridine / 3 h 5: 1M DBU / acetonitrile / 0 h 6: 1M DBU / acetonitrile / 2 h View Scheme

With  ammonia in  methanol 15 h;  Ambient temperature;  Yield given;