1: With potassium acetate; acetic anhydride; 18-crown-6 ether in hexane; chloroform; ethyl acetate T=20 - 75°C; 16 h; Cooling with ice; 2: With hydrogenchloride in methanol; chloroform T=50°C; 2 h;

1.1: chloroform / 20 °C / Cooling with ice 1.2: 0.17 h / 20 °C 1.3: 16 h / 75 °C 2.1: hydrogenchloride; water / methanol / 2 h / 50 °C View Scheme