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2005
Furan derivatives
R 0060
Unexpected Formation of Tetrasubstituted 2,3-Dihydrofurans from the Reactions
β-Keto Polyfluoroalkanesulfones with Aldehydes. — The reaction of β-keto
04- 110 of
polyfluoroalkanesulfones (I) with aldehydes under modified Knoevenagel conditions
proceeds with intermediary formation of Knoevenagel condensation products [cf. (IV)]
which react with a second sulfone molecule to finally give polysubstituted trans-2,3-dihydrofuran products (III). — (XING, C.; ZHU*, S.; J. Org. Chem. 69 (2004) 19,
6486-6488; Lab. Organofluorine Chem., Shanghai Inst. Org. Chem., Chin. Acad. Sci.,
Shanghai 200032, Peop. Rep. China; Eng.) — Mischke
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