diphenyl phosphoryl azide; triethylamine in toluene T=100°C; 20 h;

1: 3-bromo-4-fluorophenylamine With sodium hydride in N,N-dimethyl-formamide T=20°C; 0.0833333 h; 2: di-tert-butyl dicarbonate in N,N-dimethyl-formamide T=20°C; 48 h;