作者:Toshihiro Kumazawa、Takayuki Kimura、Shigeru Matsuba、Shingo Sato、Jun-ichi Onodera
DOI:10.1016/s0008-6215(01)00192-6
日期:2001.8
herein. The C-glucosyl phloroacetophenone derivatives were obtained via a regio- and stereoselective O-->C glycosyl rearrangement. Aldol condensation of the C-glucosyl phloroacetophenone derivatives with 3,4-bisbenzyloxybenzaldehyde afforded the corresponding C-glucosylchalcones. Construction of the flavone system by reaction with I(2)-Me(2)SO, followed by the elimination of the 5-benzyl protecting group
Orientin,Parkinsonin A,isoswertiajaponin和Parkinsonin B的合成,它们是8-C-β-D-吡喃葡萄糖基-3',4',5,7-四羟基黄酮,5-甲基Orientin,7-甲基Orientin和5在此分别报道了7,7-二甲基东方蛋白。通过区域和立体选择性的O→C糖基重排获得C-葡萄糖基苯乙酰苯酮衍生物。C-葡糖基苯乙酮衍生物与3,4-双苄氧基苯甲醛的醛醇缩合得到相应的C-葡糖基查耳酮。通过与I(2)-Me(2)SO反应来构建黄酮系统,然后消除黄酮结构中的5-苄基保护基团,从而得到orientin衍生物和isoswertiajaponin衍生物。Orientin衍生物与硫酸二甲酯的甲基化反应产生了Parkinsonin A衍生物,isoswertiajaponin衍生物和parkinsonin B衍生物。最后,这些C-葡糖基黄酮衍生物的氢解产生了四个