Palladium-Catalyzed Seven-Membered Silacycle Construction: 1,7-Enyne Hydroxycyclization To Give a Benzosilepine Skeleton.

A palladium-catalyzed hydroxycyclization reaction of 1,7-enynes to afford seven-membered silacycles (1 H-benzo[ b]silepine skeletons) is developed. This is the first example of both seven-membered ring construction from enynes using a palladium catalyst and hydroxycyclization of enynes to give seven-membered silacycles.