Sixteen oxo derivatives of methyl D-hexopyranosides with various regio- and stereo-chemistries were selectively synthesized by direct oxidation of non-protected methyl glycosides by the bistributyltin oxide-bromine method or by oxidation of pfrtially protected glycosides followed by deprotection. The forms of these oxoglycosides existing in pryidine-d5 and in H2O (D2O) were investigated by means of 13C-NMR spectroscopy, and it was found that interconversion between oxo and hydrate forms of oxoglycosides readily takes place.
通过双二丁基氧化
锡-
溴法直接氧化未受保护的甲基糖苷,或先氧化受部分保护的糖苷再进行脱保护,选择性地合成了十六种具有不同区域和立体
化学结构的甲基 D-
吡喃己苷的氧化衍
生物。通过 13C-NMR 光谱法研究了这些氧化糖苷在 Pryidine-d5 和
H2O(D2O)中的存在形式,发现氧化糖苷的氧化形式和
水合物形式之间很容易发生相互转化。