A short-step synthesis of 14,15-dinoreudesmanolides using intramolecular cyclization of an allylsilane

Abstract
14,15-Dinoreudesman-12,6-olides, α-methylene-γ-lactones fused to a trans-decalin ring with all three possible stereochemistries, were synthesized from a simple dialdehyde monoacetal via intramolecular cyclization of ethyl 5-(2-formylcyclohexyl)-2-(trimethylsilylmethyl)pent-2-enoate. The stereoselectivity of the cyclization reaction is described.