Reactions of α-chlorovinyl sulphones (1a and b) with the monosodium salt of diethyl malonate gave cyclopropanes (2a and b) in good yield. In contrast, 4,5-dihydrofuran-3-carboxylates (3a and b) were obtained in the reaction of compounds (1a and b) with the monosodium salt of ethyl acetoacetate. The formation mechanisms of these compounds are discussed.
I. Yamamoto, T. Sakai, K. Ohta, K. Matsuzaki and K. Fukuyama, J. Chem. Soc., Perkin Trans. 1, 1985, 2785 DOI: 10.1039/P19850002785
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