1: 71 percent / hydrazine hydrate / ethanol / 4 h / Heating 2: 63 percent / NaN3 / aq. acetic acid / 1 h / Ambient temperature 3: 66 percent / 3 h / Heating 4: 69 percent / toluene / 1.5 h / Heating View Scheme

Multi-step reaction with 2 steps 1: 71 percent / hydrazine hydrate / ethanol / 4 h / Heating2: 63 percent / NaN3 / aq. acetic acid / 1 h / Ambient temperature  

Multi-step reaction with 3 steps 1: 71 percent / hydrazine hydrate / ethanol / 4 h / Heating2: 63 percent / NaN3 / aq. acetic acid / 1 h / Ambient temperature3: 66 percent / 3 h / Heating  

With  potassium hydroxide; hydroxylamine hydrochloride in  methanol 24 h;