1: 14 percent / NaN3 / dimethylformamide / 6 h / Heating 2: 1.) NaNO2; 2.) NaN3 / 1.) acetic acid/H20, 0 - 5 deg C, 15 min; 2.) 3 h 3: 92 percent / p-(N,N-dimethylamino)-pyridine / pyridine / 2 h / Ambient temperature View Scheme

1: 14 percent / NaN3 / dimethylformamide / 6 h / Heating 2: 1.) NaNO2; 2.) NaN3 / 1.) acetic acid/H20, 0 - 5 deg C, 15 min; 2.) 3 h View Scheme