Isolation, X-ray Crystallography, and Computational Studies of Calydaphninone, a New Alkaloid from Daphniphyllum calycillum
Organic Letters2007Vol. 9(7), pp. 1355–1358
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Ying‐Tong Di, Hong‐Ping He, Yun-Song Wang, Liangbo Li, Yang Lü, Jianbo Gong, Xin Fang, Ning‐Chuan Kong, Shun‐Lin Li, Hua‐Jie Zhu, Xiao‐Jiang Hao
Abstract
[structure: see text]. A new hexacyclic alkaloid, calydaphninone (1), containing a 4-azatricyclo[5.2.2.0(1,4)]undecan ring system, has been isolated from the leaves and twigs of Daphniphyllum calycillum (Daphniphyllaceae). Its structure was elucidated by spectral and crystallographic means. Furthermore, conformations of calydaphninone (1) in solution are discussed on the basis of NMR spectral analysis and computational (B3LYP/6-31G*) results.
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