On treatment with lithium bis(trimethylsilyl)amide, α-alkyl-β-acetyloxy esters (2) and (3) undergo stereospecific ring-closure to the 5,6-dihydro-4-hydroxy-2H-pyran-2-ones(2,4-dioxotetrahydropyrans)(4) and (5).
S. Brandänge and H. Leijonmarck, J. Chem. Soc., Chem. Commun., 1985, 1097 DOI: 10.1039/C39850001097
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