Novel Conversion of Selenium-containing Five-membered Aromatics to Nitrogen-containing Six-membered Aromatics via Hetero Diels–Alder Reaction with Acetylenic Dienophiles
Treatment of selenium-containing five-membered heteroaromatics with acetylenic dienophiles afforded several nitrogen heterocycles in good to moderate yields by using thermal reaction conditions. These reactions were thought to proceed through sequential [4+2] cycloaddition-selenium extrusion pathway.