Synthesis of Polysubstituted 5-Azaindoles via Palladium-Catalyzed Heteroannulation of Diarylalkynes

A general and efficient procedure for the synthesis of functionalized 5-azaindoles through the catalyzed heteroannulation of 4-acetamido-3-iodopyridines and diarylalkynes is described. The reaction allows the preparation of a variety of substituted 2,3-diaryl-5-azaindoles in good to excellent yields.