作者:Martin A. Fascione、Nicola J. Webb、Colin A. Kilner、Stuart L. Warriner、W. Bruce Turnbull
DOI:10.1016/j.carres.2011.07.020
日期:2012.2
(TMP)- and 2,4-dimethoxyphenyl (DMP)-oxathiane spiroketal sulfonium ions is discussed, and their α-stereoselectivity in glycosylation reactions is compared to the analogous TMP- and DMP-sulfonium ions derived from an oxathiane glycosyl donor bearing a methyl ketal group. The results show that the stereoselectivity of the oxathiane glycosyl donors is dependent on the structure of the ketal group and
已经合成了新型的氧杂蒽酮螺环供体,并通过使用1,3,5-三甲氧基苯和1,3-二甲氧基苯的umpolung S-芳基化策略进行活化。讨论了所得的2,4,6-三甲氧基苯基(TMP)-和2,4-二甲氧基苯基(DMP)-氧杂蒽基螺酮tal离子的比较反应性,并将它们在糖基化反应中的α-立体选择性与类似的TMP-衍生自带有甲基缩酮基的氧杂蒽基糖基供体的DMP-离子。结果表明,氧杂蒽基糖基供体的立体选择性取决于缩酮基的结构,并且可以通过改变sulf离子上的取代基来调节反应性。