1: 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide*HCl; 4-(dimethylamino)pyridine / dimethylformamide / 25 °C 2: CH3COONH4; CH3COOH / 8 h / Heating View Scheme

ammonium acetate; acetic acid 8 h; Heating;