作者:Li, Yun-Sen、Wang, Zheng-Tao、Zhang, Mian、Zhou, Hui、Chen, Ji-Jun、Luo, Shi-De
DOI:10.1055/s-2004-815541
日期:2004.3
Seven new eremophilanolides were isolated from the roots and rhizomes of Ligularia lapathifolia. Their structures were established as 3β-angeloyloxy-8βH-eremophil-7(11)-ene-12,8α (14β, 6α)-diolide, 3β-angeloyloxy-8β-hydroxyeremophil-7(11)-ene-12,8α(14β,6α)-diolide,3β-angeloyloxy-8β-methoxyeremophil- 7(11)-ene-12,8α(14β,6α)-diolide,3β-angeloyloxy-8β-ethoxyeremophil-7(11)-ene-12, 8α (14β,6α)-diolide, 3β-angeloyloxy-10β- hydroxyeremophil-8(9),7(11)-diene-12,8(14β,6α)-diolide, 3β-angeloyloxy-8,12-expoy-12α-hydroxy-8β-methoxyeremophil-7(11)-en-14β,6α-olide and 3β-angeloyloxyeremophilan-7,11-dien-14β,6α-olide, by means of spectroscopic analyses. Moreover, application of a photooxygenation reaction on 7 resulted in the generation of 2 with an α,β-unsaturated γ-lactone moiety. This biomimetic transformation supports a biogenetic pathway proposed for 2.
从Ligularia lapathifolia的根和根茎中分离出了七种新的eremophilanolides。它们的结构被确定为:3δ²-天使酰氧基-8δ²H-eremophil-7(11)-ene-12,8δ± (14δ², 6δ±)-diolide、3δ²-天使酰氧基-8δ²-羟基eremophil-7(11)-ene-12、8δ(14δ²,6δ±)-二内酯,3δ-天使酰氧基-8δ-甲氧基-7(11)-烯-12,8δ(14δ²,6δ±)-二内酯,3δ-天使酰氧基-8δ-乙氧基-7(11)-烯-12、8δ±(14δ²,6δ±)-二内酯、3δ²-天使酰氧基-10δ²-羟基嗜苯二酚-8(9),7(11)-二烯-12,8(14δ²,6δ±)-二内酯、3δ²-天使酰氧基-8、12-expoy-12α-hydroxy-8β-methoxyeremophil-7(11)-en-14β,6α-olide 和 3β-angeloyloxyeremophilan-7,11-dien-14β,6α-olide。此外,对 7 进行光氧合反应生成了具有δ,δ-不饱和δ-内酯分子的 2。这种仿生物转化支持了 2 的生物发生途径。