The intramolecular glycosidation of the 1-C-alkyl-d-hexopyranose derivatives to form the anhydroketopyranoses having 6,8-dioxabicyclo[3.2.1]octane structures was investigated. We synthesized several 1-C-alkyl-2,3,4-tri-O-benzyl-d-hexopyranoses and found that only 5 mol% trifluoromethanesulfonic acid efficiently promoted the intramolecular glycosidation to afford the desired anhydroketopyranoses in good yields.
研究了1-C-烷基-d-
吡喃己糖衍
生物的分子内糖苷化形成具有
6,8-二氧杂双环[3.2.1]辛烷结构的脱
水吡喃酮糖。我们合成了几种 1-C-烷基-2,3,4-三-O-苄基-d-
吡喃糖,发现仅 5 mol%
三氟甲磺酸就能有效促进分子内糖苷化,以良好的产率提供所需的脱
水吡喃酮糖。