Synthesis and intramolecular transesterifications of pivaloylated methyl α-d-galactopyranosides
作者:Vesna Petrović、Srđanka Tomić、Maja Matanović
DOI:10.1016/s0008-6215(02)00055-1
日期:2002.4
Selective pivaloylations of methyl alpha-D-galactopyranoside have been studied under various reaction conditions. Partially pivaloylated products were submitted to additional acetylations. The structures were established by 1H and 13C NMR spectroscopies. Both, 2,6- and 3,6-dipivalates underwent intramolecular cyclization in neutral conditions (phosphate buffered saline, pH 7.2) to give a stable 2,3-orthoacid
已经在各种反应条件下研究了甲基α-D-吡喃半乳糖苷的选择性吡咯烷基化。部分聚乙烯醇化的产物需要进行额外的乙酰化。通过1 H和13 C NMR光谱确定结构。在中性条件下(磷酸缓冲盐溶液,pH 7.2)对2,6-和3,6-二戊酸酯进行分子内环化反应,得到稳定的2,3-原酸,新戊酰基的平行6→4迁移。