phosphoric acid; trifluoroacetic acid T=20°C; 6 h;

1: potassium carbonate / dimethyl sulfoxide; water / 1 h / 80 °C 2: trifluoroacetic acid; phosphoric acid / 6 h / 20 °C View Scheme

1.1: palladium 10 on activated carbon; copper(l) iodide; triphenylphosphine; triethylamine / ethanol / 0.25 h 1.2: 2 h / 60 °C / |Inert atmosphere 2.1: potassium carbonate / dimethyl sulfoxide; water / 1 h / 80 °C 3.1: trifluoroacetic acid; phosphoric acid / 6 h / 20 °C View Scheme

1.1: palladium 10 on activated carbon; copper(l) iodide; triphenylphosphine; triethylamine / ethanol / 0.25 h 1.2: 2 h / 60 °C / |Inert atmosphere 2.1: potassium carbonate / dimethyl sulfoxide; water / 1 h / 80 °C 3.1: trifluoroacetic acid; phosphoric acid / 6 h / 20 °C View Scheme

oxalyl dichloride Heating;

1: 98 percent / toluene / 0.5 h / 20 °C 2: 47 percent / butan-1-ol / 2 h / Heating View Scheme

1: 98 percent / toluene / 0.5 h / 20 °C 2: 47 percent / butan-1-ol / 2 h / Heating View Scheme