A simple synthesis of cis- and trans-fused 14,15-dinoreudesmanolides

Three possible stereoisomers of 14,15-dinoreudesmanolide, the structure of which consists of an α-methylene-γ-lactone ring fused to a trans-decalin ring, have been synthesized from a dialdehyde monoacetal viaα-trimethylsilylmethyl-α,β-unsaturated esters.