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前已报道了从苦玄参(Picria fel-tarrae Lour)提取液 B 部份分离出的苦玄参甙元Ⅰ(1)、Ⅱ、Ⅲ和Ⅳ的结构。本文报道从 A 部份所得的苦玄参酮(picfeltarraenone)Ⅰ(2)的结构。苦玄参酮Ⅰ(2)含量约为全草的0.002%。它是无色针状结晶,熔点218—219℃,分子式为 C_(30)H__(42)O_5。它的各种谱学数据与苦玄参甙元Ⅰ(1)基本相似,但是,在质谱中2的分子离子正好比1的分子离子少2,即2的分子中比1少2个氢原子;在~1H)(nmr)中,2缺
The structure of Bitter Ginseng I (1), II, III, and IV isolated from the B part of Picria fel-tarrae Lour extract has been previously reported. This article reports the structure of picfeltarraenone I(2) from Part A. Bitter hypermethyl ketone I (2) content is about 0.002% of whole plant. It is a colorless needle crystal with a melting point of 218-219°C and a molecular formula of C_(30)H_(42)O_5. Its various spectroscopic data are similar to those of Bitter Ginseng I (1), but the molecular ion of 2 in mass spectrometry is just 2 less than that of 1 molecule, ie, 2 molecules have 2 hydrogen atoms less than 1 molecule. ; in ~1H)(nmr), 2 missing