Vinylation of N -Heteroarenes through Addition/Elimination Reactions of Vinyl Selenones.

A new protocol for the synthesis of -vinyl azoles using vinyl selenones and azoles in the presence of potassium hydroxide was developed. This reaction proceeded under mild and transition metal-free conditions through an addition/elimination cascade process. Both aromatic and aliphatic vinyl selenones and various mono-, bi- and tri-cyclic azoles can be tolerated and give terminal -vinyl azoles in moderate to high yields. A plausible mechanism is also proposed.