A new flavone xyloside and two new flavan-3-ol glucosides from Juniperus communis var. depressa
A new flavone xyloside and two new flavan-3-ol glucosides from Juniperus communis var. depressa
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DOI：
10.1002/cbdv.200790004
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发表时间：
2007-01-01
影响因子：
2.9
通讯作者：
Nakanishi, Tsutomu
中科院分区：
文献类型：
--
作者：
Iida, Naoki;Inatomi, Yuka;Nakanishi, Tsutomu
从美国俄勒冈州桧树（Juniperus communis vars . depressa）的茎叶中分离到一种新的黄酮木糖苷1和两种新的黄烷-3-醇糖苷3和4，以及三种已知的黄酮2、11和12，五种已知的黄酮5-9和一种已知的二氢查尔酮10，并根据光谱证据对它们的结构进行了鉴定。今天在自然界中很少发现新的黄酮核，新的甲基儿茶素糖苷3和4在自然界中也很少见。此外，我们还研究了单个成分的抑制活性，即8-11等，这些成分从同一植物材料中大量分离出来用于美拉德反应。
A new flavone xyloside, 1, and two new flavan-3-ol glucosides, 3 and 4, were isolated together with three known flavones, 2, 11, and 12, five known flavans, 5-9, and a known dihydrochalcone, 10, from the stems and leaves of Juniperus communis var. depressa (Cupressaceae) collected in Oregon, U.S.A., and their structures were determined on the basis of spectral evidence. A novel flavone nucleus such as that in 1 is seldom found in nature today, and new methylcatechin glucosides 3 and 4 are also rare in nature. In addition, we investigated the inhibitory activity of individual components, i.e., 8-11, and others, that were abundantly isolated from the same plant material for the Maillard reaction.