Palladium-Catalyzed Cascade Assembly of Tricyclic Spiroethers from Diene-Alcohol Precursors.

Palladium-catalyzed carboetherification-Heck reactions to form tricyclic spiroethers, which are frequently observed as scaffold segments of various biochemical compounds, from simple diene-alcohols have been carried out in a cascade fashion. This is the first attempt to link simple alcohols with diverse, medium-sized spiroether architectures. The reported synthetic strategy is short and robust and offers rapid delivery of a broad spectrum of tricyclic spiranoid ethers.