1: 94 percent / pyridine / 3 h / Ambient temperature 2: 2.2 g / 1M methanolic ammonia / 6 h / Ambient temperature 3: 68 percent / sodium azide, ammonium chloride / dimethylformamide / 1.2 h / Heating 4: 1.) 1.4 M methanolic hydrochloric acid / 1.) reflux, 1.5 h; 2.) pyridine, roomtemp., overnight 5: 82 percent / barium hydroxide octahydrate / methanol / 0.17 h / Ambient temperature 6: 79 percent / H2 / Pd-black / H2O / 1 h View Scheme

Multi-step reaction with 4 steps 1: 94 percent / pyridine / 3 h / Ambient temperature2: 2.2 g / 1M methanolic ammonia / 6 h / Ambient temperature3: 68 percent / sodium azide, ammonium chloride / dimethylformamide / 1.2 h / Heating4: 1.) 1.4 M methanolic hydrochloric acid / 1.) reflux, 1.5 h; 2.) pyridine, roomtemp., overnight  

Multi-step reaction with 5 steps 1: 94 percent / pyridine / 3 h / Ambient temperature2: 2.2 g / 1M methanolic ammonia / 6 h / Ambient temperature3: 68 percent / sodium azide, ammonium chloride / dimethylformamide / 1.2 h / Heating4: 1.) 1.4 M methanolic hydrochloric acid / 1.) reflux, 1.5 h; 2.) pyridine, roomtemp., overnight5: 82 percent / barium hydroxide octahydrate / methanol / 0.17 h / Ambient temperature  

 in  pyridine 3 h;  Ambient temperature;