2-trans stereochemistry, and importantly, makes use of trimethylsilyl thioethers as sulfur nucleophiles to avoid the use of unpleasant free thiols. Ten examples of ethyl and phenyl thioglycosides of mono- and disaccharides were synthesised from their orthoesters using tris(pentafluorophenyl)borane (BCF) as the Lewis acid promoter and were obtained in good yield and purity.
自从武装-解除武装策略出现以来,
硫代糖苷已成为一锅
寡糖合成的重要工具。此后,糖基供体反应性的连续体已扩展到包括所谓的“超级”
硫代糖苷供体,其反应性不仅仅依赖于保护基团的诱导效应。在这里,我们报告了一种通过 1,2-原酸酯开环合成超级
硫代糖苷的新方法。该方法确保了必要的 1,2-反式立体
化学,重要的是,利用三甲基甲
硅烷基
硫醚作为
硫亲核试剂,以避免使用令人不快的游离
硫醇。