Two novel flavone glycosides, 3′-hydroxy-5,4′-dimethoxy-6,7-methylenedioxyflavone-3-O-[β-D-xylopyranosyl(1→6)]-β-D-glucopyranoside(1)and5,4′-dimethoxy-3′-isopropenylacetyl-6,7-methylenedioxyflavone-3-O-[β-D-xylopyranoxyl(1→6)]-β-D-glucopyranoside (2), were isolated from Polygonum sphaerostachyum Meisn., and their structures were deduced by spectral and chemical methods. This is the first report on the isolation of flavone glycosides from P. sphaerostachyum.
圆穗蓼中的新黄酮甙成分
安红纲1 郑尚珍2* 沈彤2 郑敏燕2 沈序维2
(1. 张掖师范专科学校化学系,甘肃张掖734000;2. 西北师范大学化学系,兰州730070)
摘要:从圆穗蓼 (PolygonumsphaerostachyumMeisn .)中分离得到 2个新黄酮甙 ,经光谱分析和化学方法鉴定为 :3′_羟基_5 ,4′_二甲氧基_6 ,7_二氧亚甲基黄酮_3_O_[β_D_吡喃木糖基 (1→ 6 ) ]_β_D_吡喃葡萄糖甙 (1)和 5 ,4′_二甲氧基_3′_异丙烯基乙酰基_6 ,7_二氧亚甲基黄酮_3_O_[β_D_吡喃木糖基 (1→ 6 ) ]_β_D_吡喃葡萄糖甙 (2 ) ,分别命名为圆穗蓼素A和圆穗蓼素B。
关键词: 圆穗蓼;黄酮甙;圆穗蓼素A;圆穗蓼素B
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