8,4′-Oxyneolignaneglucosidesfromanaqueousextractofbanlangen(Isatisindigoticaroot)andtheirabsoluteconfigurations

摘要： Threepairsofglycosidic8,4′-oxyneolignanediastereoisomers,namedisatioxyneolignosidesA-F(1–6),wereisolatedfromanaqueousextractofIsatisindigoticaroots.Theirstructuresandabsoluteconfigurationswereelucidatedbycomprehensivespectroscopicdataanalysisandenzymehydrolysis.ThevalidityofΔδ_(C8-C7)valuestodistinguishthreoanderythroarylglycerolunitsandCottoneffectsat235±5nmtodetermineabsoluteconfigurationsatC-8in1–6andtheiraglycones(1a–6a)arediscussed. ... （共9頁）