作者:Yali Li、Jiansong Sun、Yanqing Gong、Biao Yu
DOI:10.1021/jo200440r
日期:2011.5.20
Clemoarmanoside A and Clemahexapetoside A, two novel cyclic dimers of 4-(glycosyloxy)benzoates containing the unusual d-allopyranose as one of the sugar units, were synthesized for the first time. The convenient synthetic approach was adapted to the assembly of the symmetrical trimeric, tetrameric, and pentameric congeners. The synthesis clarified the discrepancy in the NMR data reported for the natural
首次合成了Clemoarmanoside A和Clemahexapetoside A,这两种新型的4-(糖氧基氧基)苯甲酸酯的新型环状二聚体,其中含有不寻常的d-吡喃戊糖作为糖单元之一。方便的合成方法适用于对称三聚体,四聚体和五聚体同源物的组装。合成澄清了天然产物报道的NMR数据的差异。Clemahexapetoside A的X射线衍射分析表明,它采用了扶手椅构型,两个碳水化合物环分别为手臂,两个芳香环分别为椅背和座位。