B(C6F5)3-Catalyzed Michael Reactions: Aromatic C-H as Nucleophiles.

The Michael reaction is a widely used reaction for the C-C coupling of electron-poor olefins and C(sp3)-H pronucleophiles. Herein we report the Michael reaction between alkenes and aromatic as well as heteroaromatic compounds as aromatic C(sp2)-H nucleophiles under mild conditions. The reaction is catalyzed by readily available Lewis acidic B(C6F5)3 and proceeds with high regioselectivity for a wide substrate scope.