1.1: 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; benzotriazol-1-ol / N,N-dimethyl-formamide / 0.33 h / 20 °C 1.2: 1.08 h / 20 - 130 °C / Microwave irradiation 2.1: thionyl chloride; pyridine / dichloromethane / 0 - 20 °C 2.2: 48 h / 50 °C View Scheme