Araki K, Yun WQ, O'Toole J, Toscano PJ, Welch JT. The synthesis of 2,3-dideoxy-2-fluoro-3-C-methylpentose-containing nucleosides via [3,3]-sigmatropic rearrangements.
Carbohydr Res 1993;
249:139-61. [PMID:
8252552 DOI:
10.1016/0008-6215(93)84067-g]
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Abstract
[3,3]-Sigmatropic rearrangement of in situ-formed [O,O]-silyl ketene acetals of butenyl fluoroacetates was used as the key step in the synthesis of racemic 2,3-dideoxy-2-fluoro-3-C-methylpentofuranoses. The product pentofuranoses were transformed further into pyrimidine and purine nucleosides. The conformations of the synthetic carbohydrates were confirmed by single-crystal X-ray diffraction studies and indicated that previous structural assignments made by NMR were in error.
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