1: With sodium hydroxide; water T=20 - 25°C; 2: With hydrogenchloride in water T=30°C; pH=1; Product distribution / selectivity;

1: With triethylamine in 1,4-dioxane T=50°C; 2: With sodium hydroxide; water in 1,4-dioxane T=50°C; 6 h; 3: With hydrogenchloride in water pH=3;

1: With triethylamine in 1,4-dioxane T=20°C; 5 h; 2: With methanol; sodium hydroxide; water T=20 - 50°C; 4 h; 3: With hydrogenchloride in water Product distribution / selectivity;

benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine in N,N-dimethyl-formamide T=20°C; 20 h; Product distribution / selectivity;