New <i>C</i>-Glycosylated <font>α</font>-Amino Acid Synthesis by Addition Reaction of an Amino Acid Organozinc Reagent on Carbohydrate-Derived Aldehydes
作者:Nicolas Boutard、Frédéric Labéguère、Yves Vidal、Jean-Pierre Lavergne、Jean Martinez
DOI:10.1080/00397911.2010.540698
日期:2012.5.15
C-glycosylated amino acid structures could be prepared by addition of an amino acid organozinc on carbohydrates bearing an aldehyde function. For this purpose, a new iodinated amino acid bearing a four-carbon side chain was conveniently prepared in two steps. Conversion into the corresponding organozinc reagent was optimal in acetonitrile using zinc/copper activated with 1,2-dibromoethane and trimethylsilyl chloride
摘要 通过在具有醛功能的碳水化合物上添加氨基酸有机锌可以制备两种未报道的 C-糖基化氨基酸结构。为此,一种带有四碳侧链的新碘化氨基酸可以方便地分两步制备。使用以 1,2-二溴乙烷和三甲基氯硅烷活化的锌/铜,在乙腈中转化为相应的有机锌试剂是最佳的。使用 BF3·OEt2 作为路易斯酸将该有机锌化合物添加到乙腈中的简单醛中,制定了一个方案。当应用于核糖苷和糖苷醛衍生物时,该协议以可接受的产率产生了新的 C-糖基化氨基酸。图形概要