Palladium-Catalyzed Cyclizations of Bromo Dienes

Article abstract of DOI:10.1021/jo00165a002

1-Bromo 1,5-dienes, 2-bromo 1,6-dienes, and 2-bromo 1,7-dienes have been found to undergo palladiumtriarylphosphine catalyzed cyclizations in the presence of piperidine to form five- or six-membered ring products in good yields.The major or only cyclic products formed are piperidino- or (piperidinomethyl)cyclopentenes and -cyclohexenes.The five-membered ring products are preferred over the six when there is a choice.