Palladium-Catalyzed Dearomative Cyclization by a Norbornene-Mediated Sequence: A Route to Spiroindolenine Derivatives.

The first palladium-catalyzed dearomative cyclization via a modified Catellani-type C–H functionalization has been realized. The new strategy led to a series of spiroindolenine derivatives bearing an all-carbon quaternary spirocenter from simple aryl halides and substituted indoles.