作者:Mohammed A. Salam、Horace S. Isbell
DOI:10.1016/s0008-6215(00)81005-8
日期:1982.3
Abstract Reaction of methyl α- d -glucopyranoside and methyl α- d -mannopyranoside with alkaline hydrogen peroxide and a ferrous salt, at room temperature and below, afforded the corresponding d -glycosiduronic acids. On dehydration, the acids gave the corresponding gamma lactones, with a shift of the pyranoid ring to a furanoid ring. Surprisingly, the glycosidic methyl group was retained during the
摘要在室温及以下,甲基α-d-吡喃葡萄糖苷和甲基α-d-甘露吡喃糖苷与碱性过氧化氢和亚铁盐反应,得到相应的d-糖苷醛糖醛酸。脱水后,酸产生相应的γ-内酯,吡喃环变成呋喃环。出乎意料的是,在氧化反应和吡喃糖-呋喃糖相互转化过程中保留了糖苷甲基。通过涉及伪无环中间体形成的机制使这种保留合理化。另一个出乎意料的反应是,在室温下静置5-6天后,稍湿的甲基d-葡萄糖吡喃葡萄糖醛内酯糖浆转变为结晶的d-呋喃呋喃尿酸-6,3-内酯和甲基α-d-mannopyranosidurono-6,3结晶。 -内酯转变成结晶d -mannofuranurono-6,