Treatment of unsaturated keto- or aldo-esters with Sml2 in tetrahydrofuran (THF) or THF–hexamethylphosphoramide affords bicyclic γ-lactones in moderate to good yields.
S. Fukuzawa, M. Iida, A. Nakanishi, T. Fujinami and S. Sakai, J. Chem. Soc., Chem. Commun., 1987, 920 DOI: 10.1039/C39870000920
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