Fluoridolysis of 5,6-epoxy carbohydrates: application to the synthesis of 5-fluoro lactosamine and isolactosamine glycosides
作者:Tara L. Hagena、James K. Coward
DOI:10.1016/j.tetasy.2009.03.025
日期:2009.5
The synthesis of 6-selenophenyl derivatives of β-1,3 and β-1,4 disaccharides has been explored for the purpose of extending our epoxide fluoridolysis methodology to the synthesis of 5-fluoro analogues of N-acetyl isolactosamine (isoLacNAc, lacto-N-biose) and N-acetyl lactosamine (LacNAc) glycosides. Successful synthesis of the C-6 selenium-containing disaccharides was achieved via Lewis acid-mediated
为了将我们的环氧化物荧光分解方法扩展到N-乙酰基异乳糖胺(isoLacNAc,乳酸酯-)的5-氟类似物的合成,已经探索了β-1,3和β-1,4二糖的6-硒苯基衍生物的合成。N-二糖)和N-乙酰基乳糖胺(LacNAc)糖苷。通过路易斯酸介导的供体和受体底物成功合成了含C-6硒的二糖,后者含有选择性保护的C-6羟基,可最终转化为所需的6-硒代苯二糖。相反,在多种条件下使用含硒受体底物不能产生所需的含硒二糖。将6-硒代苯衍生物氧化为相应的亚硒酸盐,然后进行热消除,得到环外烯烃,其被转化为5,6-环氧化物。环氧氟化反应产生所需的目标化合物,即1型和2型聚糖的5-氟β-辛基糖苷类似物。