Claisen rearrangement of hexenopyranoside allyl ethers: A new approach to α-branched-chain dicarbonyl sugars
作者:Kimiaki Furuichi、Hiromasa Hashimoto、Toshio Miwa
DOI:10.1016/0008-6215(91)80006-9
日期:1991.11
corresponding allyl ethers. Oxidation of the allyl ethers, followed by thermal elimination and rearrangement, gave C -allylhexosuloses in good yield. Rearrangement of ethers 10a and 10c was especially stereoselective, giving axially oriented C -allylhexosulose derivatives, which were readily epimerized to their equatorial isomers in quantitative yield. In the Claisen rearrangement of the crotyl ether 14c ,
摘要将2,3-脱水吡喃糖苷与苯基硒化钠裂解制备的β-羟基苯基硒化物被定量转化为相应的烯丙基醚。烯丙基醚的氧化,然后进行热消除和重排,以高收率得到C-烯丙基己糖。醚10a和10c的重排特别是立体选择性的,得到轴向取向的C-烯丙基己糖衍生物,其易于以定量产率差向为其赤道异构体。在巴豆醚14c的克莱森重排中,糖的手性转移到新形成的不对称碳原子上。该程序提供了将脱水糖转化为C-烯丙基己糖衍生物的便利方法。