1: With sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride in water T=40°C; 3 h; 2: in water; ethylene glycol T=100°C; 20 h;

1: With diphenyl phosphoryl azide; triethylamine in toluene T=20°C; Curtius Rearrangement; 3 h; Heating / reflux; 2: With tert-butyl alcohol 20 h; Heating / reflux;