1.5 h; Heating; Yield given;

1: 1.5 h / Heating 2: 85 percent / K2CO3 / acetonitrile / 4 h / Heating View Scheme

hydrogenchloride in water; tert-butyl alcohol Heating / reflux;

1: 1.5 h / Heating 2: 85 percent / K2CO3 / acetonitrile / 4 h / Heating 3: 77 percent / 30percent ethanolic HCl / ethyl acetate / 1 h / Ambient temperature 4: 1.) FeCl3*6H2O, activated carbon, 2.) hydrazine monohydrate / 1.) MeOH, THF, reflux, 30 min, 2.) MeOH, THF, reflux, 14 h 5: 78 percent / ethanol / 1.5 h / Heating View Scheme

1: 1.5 h / Heating 2: 85 percent / K2CO3 / acetonitrile / 4 h / Heating 3: 77 percent / 30percent ethanolic HCl / ethyl acetate / 1 h / Ambient temperature 4: 1.) FeCl3*6H2O, activated carbon, 2.) hydrazine monohydrate / 1.) MeOH, THF, reflux, 30 min, 2.) MeOH, THF, reflux, 14 h 5: 91 percent / acetic acid / 0.67 h / 80 - 90 °C 6: 100 percent / trimethyltin azide / toluene / 29 h / Heating 7: 85 percent / 1 N aq. NaOH / methanol / 1 h / 80 - 90 °C View Scheme

1: 1.5 h / Heating 2: 85 percent / K2CO3 / acetonitrile / 4 h / Heating 3: 77 percent / 30percent ethanolic HCl / ethyl acetate / 1 h / Ambient temperature View Scheme

1: 1.5 h / Heating 2: 85 percent / K2CO3 / acetonitrile / 4 h / Heating 3: 77 percent / 30percent ethanolic HCl / ethyl acetate / 1 h / Ambient temperature 4: 1.) FeCl3*6H2O, activated carbon, 2.) hydrazine monohydrate / 1.) MeOH, THF, reflux, 30 min, 2.) MeOH, THF, reflux, 14 h 5: 91 percent / acetic acid / 0.67 h / 80 - 90 °C View Scheme

1: 1.5 h / Heating 2: 85 percent / K2CO3 / acetonitrile / 4 h / Heating 3: 77 percent / 30percent ethanolic HCl / ethyl acetate / 1 h / Ambient temperature 4: 1.) FeCl3*6H2O, activated carbon, 2.) hydrazine monohydrate / 1.) MeOH, THF, reflux, 30 min, 2.) MeOH, THF, reflux, 14 h 5: 91 percent / acetic acid / 0.67 h / 80 - 90 °C 6: 100 percent / trimethyltin azide / toluene / 29 h / Heating View Scheme

1: 1.5 h / Heating 2: 85 percent / K2CO3 / acetonitrile / 4 h / Heating 3: 77 percent / 30percent ethanolic HCl / ethyl acetate / 1 h / Ambient temperature 4: 1.) FeCl3*6H2O, activated carbon, 2.) hydrazine monohydrate / 1.) MeOH, THF, reflux, 30 min, 2.) MeOH, THF, reflux, 14 h View Scheme