Spirodiepoxide-based cascades: direct access to diverse motifs.

Allene epoxide formation/opening reaction sequences enabled direct access to diverse products. Described here are a single flask procedure for allene preparation and allene oxidation/derivatization reactions that give, among others, diendiol, diyndiol, α′-hydroxy-γ-enone, dihydrofuranone, butenolide, and δ-lactone products.