A new stereocontrolled synthetic pathway to 1,2,4-trioxygenated 1,3-dienes from pyruvic aldehyde dimethyl acetal (14a) is described. Reacting the cyclohexylamine-derived imine of this starting material with chloroalkyl ethers under basic conditions affords ketoacetals 18−20, which were then transformed into eight different enoxysilanes 12. A δ-elimination triggered by tert-butyllithium yields 1,2,4-trioxygenated