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3,4-disubstituted furans are converted into gamma-hydroxy-butenolides by treatment with NaClO(2) in aqueous EtOH containing NaH(2)PO(4). 相似文献
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The densely functionalized ketene acetal benesudon, which is a bioactive fungal metabolite, was synthesized from D-glucose by a route involving radical cyclization to form the five-membered ring, and oxidative decarboxylation to generate the key central double bond. The originally suggested stereochemistry for the quaternary center C(5) must be revised, as both C(5) epimers were prepared and a comparison with an authentic sample was made. The absolute configuration of benesudon is 4S,5R,6S. 相似文献
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The unusual ketene acetal benesudon, which is a bioactive fungal metabolite, was synthesized from d-glucose by a route involving radical cyclization to form the five-membered ring and oxidative decarboxylation to generate the key central double bond. The originally suggested stereochemistry for the quaternary center C(5) must be revised, as both possibilities were prepared and a comparison with an authentic sample was made. The absolute configuration of benesudon is 4S,5R,6S. 相似文献
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Synthesis of the core structure of the fungal metabolite benesudon: use of oxidative decarboxylation
[chemical reaction: see text]. The core structure (5) of the fungal metabolite benesudon (1) was synthesized, the key step being oxidative decarboxylation of acid 17. 相似文献
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