Abstract Formal [3+ 2] cycloadditions of 5-alkoxyfuran-2 (5H)-ones 1 and 2 with allenylsulfones 3–5, promoted by different nucleophiles, afford 3-alkoxy-5-arylsulfonyl-3, 3 a, 6, 6 a-tetrahydro-1H-cyclopenta [c] furan-1-ones in good yields with complete control of both regio-and π-facial selectivity. The incorporation of a sulfinyl group on the furanone ring enhances the reactivity of the furanones and allows the synthesis of optically pure, bicyclic ...
[Linden, Johannes B. van der; Asten, Peter F. T. M. van; Braverman, Samuel; Zwanenburg, Binne Recueil des Travaux Chimiques des Pays-Bas, 1995 , vol. 114, # 2 p. 51 - 60]
