Further new complex daphniphyllum alkaloids from the stems and leaves of Daphniphyllum calycinum: Structure and stereochemistry

文献类型： 外文期刊

第一作者： Shen, Shou-Mao

作者： Shen, Shou-Mao;Guo, Yue-Wei;Shen, Shou-Mao;Li, Heng;Wang, Jian-Rong;Guo, Yue-Wei;Zeng, Yan-Bo

作者机构：

关键词： Daphniphyllum calycinum; Daphniphyllum alkaloids; Absolute configuration

期刊名称：TETRAHEDRON （ 影响因子：2.457； 五年影响因子：2.22 ）

ISSN： 0040-4020

年卷期： 2020 年 76 卷 49 期

页码：

收录情况： SCI

摘要： Four new daphniphyllum alkaloids, namely daphnicalycines A-D (1-4), together with nineteen known related ones (5-7 and 11-26), were isolated from the stems and leaves of Daphniphyllum calycinum. Their structures including the absolute configurations were unambiguously elucidated by extensive spectroscopic analysis, X-ray diffraction analysis and comparison with the reported data. In particular, with the assistance of X-ray diffraction analysis, we were able not only, for the first time, to give full H-1 and C-13 NMR assignment of daphniteijsmanine (7) and to elucidate its absolute stereochemistry, but also lead to correct the structure of caldaphnidine E (9). The confusions reported for 1 and daphnimacropine (8) in the literature were also clarified. (C) 2020 Elsevier Ltd. All rights reserved.

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