1: ortho-bromobenzaldehyde; trimethylsilylacetylene With bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide in tetrahydrofuran T=40°C; 0.12 h; Inert atmosphere; 2: With KF*2H2O in methanol T=20°C; 0.5 h; 3: ethanol With indium trifluoromethanesulfonate; orthoformic acid triethyl ester T=20°C; 1 h;

1: bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; triethylamine / 12 h / 65 °C / |Inert atmosphere 2: toluene-4-sulfonic acid / methanol / 4 h / 20 °C 3: potassium carbonate / methanol / 2 h / 20 °C View Scheme

1: toluene-4-sulfonic acid / methanol / 4 h / 20 °C 2: potassium carbonate / methanol / 2 h / 20 °C View Scheme