1: 73 percent / 18 percent HCl / 4 h / Ambient temperature 2: 89 percent / 5 percent NaOH, aq. / 19 h / Ambient temperature View Scheme

Multi-step reaction with 4 steps 1: 71 percent / pyridine / 3.5 h / Heating2: 67 percent / NH2OH / methanol / 0.5 h / Heating3: 67 percent / conc. H2SO4 / 1.58 h / 75 - 80 °C4: 70 percent / CHCl3 / 1 h / Heating  

Multi-step reaction with 2 steps 1: 67 percent / conc. H2SO4 / 1.58 h / 75 - 80 °C2: 70 percent / CHCl3 / 1 h / Heating  

Multi-step reaction with 4 steps 1: 89 percent / 5 percent NaOH, aq. / 19 h / Ambient temperature2: 67 percent / NH2OH / methanol / 0.5 h / Heating3: 67 percent / conc. H2SO4 / 1.58 h / 75 - 80 °C4: 70 percent / CHCl3 / 1 h / Heating  

With  hydrogenchloride 4 h;  Ambient temperature;