两性离子
部分
亚胺离子
化学
立体化学
碳负离子
戒指(化学)
分子
离子
有机化学
作者
Wen Zhang,Yue‐Wei Guo,Karsten Krohn
标识
DOI:10.1002/chem.200600056
摘要
Three novel alkaloids, macropodumines A-C (1-3), were isolated from the stem of Daphniphyllum macropodum Miq. Interestingly, the structure of macropodumine A (1) was characterized as having a fused pentacyclic system including an unusual eleven-membered macrolactone ring, whereas macropodumine B (2) contains a rare cyclopentadienyl carbanion, which is stabilized as a zwitterion by an internal iminium cation. The structures of these new metabolites were established on the basis of their detailed spectroscopic analysis. In particular, the unique structure of zwitterion 2 was further confirmed by using single-crystal X-ray diffraction analysis.
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