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Multi-membered O,S-heterocycles Multi-membered O,S-heterocycles R 0691Synthesis of Seven-Membered Oxacycles. Part 2. The Furan Approach. -The synthesis of a bicyclic lactone (IX) with trans ring junction from readily available starting materials is reported. The synthetic route is based on the oxidation of the furan (V) with singlet oxygen followed by intramolecular Michael addition as the key strategy.-(FALL*, Y.; VIDAL, B.; ALONSO, D.; GOMEZ, G.; Tetrahedron Lett. 44 (2003) 24, 4467-4469; Dep. Quim. Org., Univ. Vigo, E-36200 Vigo, Spain; Eng.) -Mais 37-136

Die Reaktivität verschiedener anionischer Spezies in der Ringöffnung von Ethylenoxid (I) wird untersucht.

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