new type of palladium-catalyzed 6-endo-selective alkyl-Heck reaction of unactivated alkyliodides has been described. This strategy provides efficient access to a variety of 5-phenyl-1,2,3,6-tetrahydropyridine derivatives, which are important structural motifs for bioactive molecules. This process displays a broad substrate scope with excellent 6-endo selectivity. Mechanisticinvestigations reveal that