2,3-Unsaturated enoses. A Pummerer rearrangement route to sugar vinyl sulfides and synthesis of 3-deoxy-3-alkyl/arylsulfinyl pyranosides
作者:Arunima Mukherjee、Narayanaswamy Jayaraman
DOI:10.1016/j.tet.2012.08.011
日期:2012.10
exopyranosides is reported. Treatment of sulfinyl-arabino-hexopyranoside derivatives, obtained through oxidation of the corresponding thio-derivatives, with trifluoroacetic anhydride (TFAA)/pyridine led to a facile formation of 2,3-dideoxy-3-alkyl/arylthio-hex-2-enopyranosides. Upon conversion of sugar vinyl sulfides to vinyl sulfoxides, conjugate addition reactions were conducted with alkoxides, to
据报道2,3-二脱氧-3-烷基/芳基亚磺酰基-阿拉伯糖-己吡喃糖苷的Pummerer重排。用三氟乙酸酐(TFAA)/吡啶处理通过氧化相应的硫代衍生物而获得的亚磺酰基-阿拉伯糖基-己吡喃糖苷衍生物,导致2,3-二脱氧-3-烷基/芳硫基-己-2--2-吡喃糖苷的容易形成。在将糖类乙烯基硫化物转化为乙烯基亚砜后,与醇盐进行共轭加成反应,以单独的甘露聚糖构型得到3-脱氧-3-烷基/芳基亚磺酰基吡喃糖苷。尽管共轭加成反应没有用醚保护基进行,但是糖乙烯基亚砜中的酯保护基和游离羟基使反应得以进行。