sodium carbonate; tetrakis(triphenylphosphine) palladium(0) in ethylene glycol dimethyl ether; water T=90°C; 4 h;

1: With diphenyl phosphoryl azide; triethylamine in N,N-dimethyl-formamide T=20°C; Curtius Rearrangement; 3 h; 2: With water in N,N-dimethyl-formamide T=100°C; 1 h;