Abstract
Abstract In the presence of a catalytic amount of trityl perchlorate, the intermediate adducts, produced in situ by the conjugate addition of silyl enol ethers with α,β-unsaturated ketones, react with aldehydes to give the corresponding γ-acyl substituted δ-hydroxy ketone derivatives stereoselectively in high yields. The ketones thus obtained are easily converted to tetrahydropyran derivatives.
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