1: With sodium hydroxide in ethanol; water 2 h; Heating / reflux; 2: With hydrogenchloride in ehanol; water

ammonium chloride; benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine in dimethyl sulfoxide T=20°C; 15 h;