Palladium(II)-catalyzed oxidative annulation of alkenylindoles with alkynes initiated by C-H activation

A palladium(II)-catalyzed annulation of alkenylindoles with diarylethynes initiated by C-H bond activation was developed. This method provided a convenient way for the synthesis of dihydrocyclopenta[b]indoles by enyne cyclization initiated by C-H bond activation.