An improved method for the synthesis of protected glycosyl fluorides from thioglycosides using N,N-diethylaminosulfur trifluoride (DAST)
作者:Katsuhiko Suzuki、Yukishige Ito、Osamu Kanie
DOI:10.1016/j.carres.2012.07.003
日期:2012.10
examined using N,N-diethylaminosulfur trifluoride (DAST). Although the reaction proceeded without N-bromosuccinimide (NBS), in some cases it was found that the electrophilicity of the Vilsmeier-type electrophilic sulfinium cation species was not sufficient for the activation of certain less-reactive thioglycosides. Here, we report the results of fluorination reactions of a series of monosaccharides using
使用N,N-二乙基氨基三氟化硫(DAST)检查了硫糖苷直接转化为寡糖合成中常用的糖基氟化物。尽管反应在没有N-溴代琥珀酰亚胺(NBS)的情况下进行,但在某些情况下,发现Vilsmeier型亲电electro阳离子物种的亲电性不足以活化某些反应性较低的硫代糖苷。在这里,我们报告了在不存在NBS的情况下使用DAST进行的一系列单糖氟化反应的结果,并讨论了在存在二甲基(甲硫基)s三氟甲烷磺酸盐(DMTST)的情况下加速反应的过程,从而提高了产品收率。