potassium carbonate in dimethyl sulfoxide 18 h; Ambient temperature;

1: 68 percent / aq. HCl / 18 h / Heating 2: 17 percent / aq. NaOH / dioxane / 1 h / Heating 3: 90 percent / H2 / 10percent Pd/C / ethanol / 15 h / 2585.7 Torr View Scheme

1: 68 percent / aq. HCl / 18 h / Heating 2: 50 percent / t-BuOK / dimethylformamide / 1.5 h / -10 °C View Scheme

hydrogenchloride 18 h; Heating;

1: 68 percent / aq. HCl / 18 h / Heating 2: 50 percent / t-BuOK / dimethylformamide / 1.5 h / -10 °C 3: 93 percent / triphenylphosphine, CCl4 / dimethylformamide / 15 h / Ambient temperature View Scheme