Crotocascarins I–K: Crotofolane-Type Diterpenoids, Crotocascarin γ, Isocrotofolane Glucoside and Phenolic Glycoside from the Leaves of <i>Croton cascarilloides</i>
作者:Susumu Kawakami、Katsuyoshi Matsunami、Hideaki Otsuka、Masanori Inagaki、Yoshio Takeda、Masatoshi Kawahata、Kentaro Yamaguchi
DOI:10.1248/cpb.c15-00635
日期:——
From the 1-BuOH-soluble fraction of a methanol (MeOH) extract of the leaves of Croton cascarilloides, crotofolanes: crotocascarins I–K, nor-crotofolane: crotocascarin γ, isocrotofolane glucoside and phenolic glycoside were isolated by a combination of various separation techniques. Their structures were elucidated mainly from the NMR spectroscopic evidence. The structure of crotocascarin K was first elucidated by spectroscopic analysis and then was confirmed by X-ray crystallographic analysis. Its absolute structure was finally determined by the modified Mosher’s method. Isocrotofolane glucoside was found to possess a new skeleton, however, its absolute structure remains to be determined.
通过多种分离技术的组合,从巴豆叶的甲醇 (MeOH) 提取物的 1-BuOH 可溶部分中分离出巴豆叶烷:巴豆豆苷 I–K、去甲巴豆叶烷:巴豆豆苷 γ、异巴豆叶烷葡萄糖苷和酚苷。 。它们的结构主要通过核磁共振波谱证据来阐明。首先通过光谱分析阐明了crotocascarin K 的结构,然后通过X 射线晶体学分析进行了确认。最终通过修改后的Mosher方法确定了其绝对结构。发现异辛酰呋喃葡萄糖苷具有新的骨架,但其绝对结构仍有待确定。