sodium azide in N,N-dimethyl-formamide 12 h; Ambient temperature;

1: 80 percent / NaN3 / dimethylformamide / 12 h / Ambient temperature 2: 77 percent / H2 / Pd/C(10percent) / methanol / 4 h / Ambient temperature 3: 79 percent / Pd/C(10percent) / diphenyl ether / 12 h / Heating View Scheme