The norbornene shuttle: multicomponent domino synthesis of tetrasubstituted helical alkenes through multiple C--H functionalization.

Shall we dance? Within the proposed mechanism for the palladium-catalyzed title reaction, the strained alkene norbornene (or norbornadiene) enters and exits the catalytic cycle in a catalytic "square dance", acting as both a promoter and a coupling partner in the formation of four carbon-carbon bonds, two of them by challenging C--H activation processes.