作者:Sanat K. Dwivedi、Anakshi Khare、Maheshwari P. Khare
DOI:10.1016/s0008-6215(00)86028-0
日期:1981.5
yield. In the absence of any free hydroxyl group in the molecule, rigid bicyclic, and flexible monocyclic, 2,3-anhydro-α- d -aldopyranoside derivatives, mainly yielded 3-bromo-3-deoxy products through an unusual, diequatorial opening of the oxirane ring. In contrast, similar 2,3-anhydro derivatives having a free hydroxyl group in the molecule underwent the usual, diaxial opening of the oxirane ring, affording
摘要发现一些2,3-脱水醛,己和吡喃吡喃糖苷衍生物与MgBr 2-醚化物反应可提供高收率的溴脱氧产物。在分子中不存在任何游离羟基的情况下,刚性双环和柔性单环2,3-脱水-α-d-醛吡喃糖苷衍生物主要通过不寻常的二甲基吡啶键开环生成3-溴-3-脱氧产物。环氧乙烷环。相反,对在分子中具有游离羟基的相似的2,3-脱水衍生物进行通常的环氧乙烷环的双轴开环,得到2-溴-2-脱氧产物。然而,尽管不存在游离羟基,但是甲基2,3-脱水4-O-甲基-β-d-核吡喃糖苷经历了环氧乙烷环的反式-双轴打开。