Two Efficient Syntheses of Protected 4‐Deoxy‐<scp>D</scp>‐lyxo‐hexose (4‐Desoxy‐<scp>D</scp>‐mannose)
作者:Karsten Krohn、Ivan Shuklov
DOI:10.1080/07328300600770519
日期:2006.6
procedure, a nucleophilic displacement of the allylic mesylate 4 by hydride was combined with a highly stereoselective osmylation of olefin 6 to afford diol 7. In the second radical procedure, tributyl tin hydride was substituted by the cheap and environmentally friendly hypophosphorous acid as a hydrogen donor in the reduction of xanthate 13 to 4‐deoxy lyxo‐hexose 14.
描述了四种不同保护的4-脱氧-D-己糖-己糖衍生物7、8、12和14的形成。在第一个步骤中,将烯丙基甲磺酸酯4的氢化物的亲核取代与烯烃6的高度立体选择性渗透作用结合在一起,得到二醇7。在第二个自由基步骤中,氢化三丁基锡被廉价且环保的次磷酸取代氢供体将黄原酸酯13还原为4-脱氧lyxo-hexose 14。