1.1: dichloromethane / 12 h / 0 - 20 °C / Inert atmosphere 2.1: triethylamine / dichloromethane / 0 - 20 °C / Reflux 3.1: hydrogenchloride / isopropyl alcohol; water; methanol / 1.5 h / 50 °C 3.2: 1.25 h / 0 - 70 °C View Scheme