1: 90 percent / K2CO3 / methanol / 3 h / 0 °C 2: 84 percent / K2CO3 / dimethylformamide / 5 h / 20 °C 3: aq. HCl / dioxane / 24 h / 80 °C 4: 1.86 g / K2CO3 / dimethylformamide / 1 h / 60 °C 5: hydrogen / Pd/C / ethyl acetate; ethanol / 5 h / 20 °C / 760 Torr 6: 1.11 g / potassium nitrosodisulfonate / H2O; acetone / 3 h / 20 °C View Scheme

hydrogenchloride in ethanol Heating;