New sesquiterpene dilactone from Pertya glabrescens.
作者:SEIJI NAGUMO、MASAHIRO NAGAI、TAKAO INOUE
DOI:10.1248/cpb.30.586
日期:——
A germacranolide, namely pertilide (I), mp 186-187°C (dec.), [α]20D+1.4°, C15H16O4, was isolated from the leaves of Pertya glabrescens SCH. BIP. (Compositae). I yielded the 4, 5-epoxide (IV) on peracid oxidation, and the 1(10), 3-dien-14-oic acid (III) on catalytic hydrogenation. Chemical and spectroscopic studies (especially NMDR experiments on I, III and IV) led to the proposal for I of the structure formulated as I (devoid of its stereochemistry) in Chart 1. The results of X-ray crystallographic analysis of I and its dibromide (VI) established the stereochemistry of I as [1(10)Z, 4E]-(3R, 7R, 8S)-germacra-1(10), 4, 11(13)-triene-12, 8 : 14, 3-diolide.
从 Pertya glabrescens SCH 的叶子中分离得到一种 Germacranolide,即 Pertilide (I),熔点 186-187°C (dec.),[α]20D+1.4°,C15H16O4。 BIP。 (菊科)。通过过酸氧化得到 4, 5-环氧化物 (IV),通过催化氢化得到 1(10), 3-二烯-14-油酸 (III)。化学和光谱研究(特别是 I、III 和 IV 的 NMDR 实验)导致提出了 I 的结构,如图 1 所示,I 的结构被表述为 I(缺乏其立体化学)。 I 及其二溴化物的 X 射线晶体分析结果(VI) 确定 I 的立体化学为 [1(10)Z, 4E]-(3R, 7R, 8S)-germacra-1(10), 4, 11(13)-triene-12, 8 : 14, 3 -二内酯。