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

文献类型： 外文期刊

作者： Shen, Shou-Mao 1 ; Li, Heng 2 ; Wang, Jian-Rong 2 ; Zeng, Yan-Bo 3 ; Guo, Yue-Wei 1 ;

作者机构： 1.Nanjing Univ Chinese Med, Sch Chinese Mat Med, Nanjing 210023, Peoples R China

2.Chinese Acad Sci, Shanghai Inst Mat Med, State Key Lab Drug Res, 555 Zu Chong Zhi Rd,Zhangjiang Hitech Pk, Shanghai 201203, Peoples R China

3.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Hainan Prov Key Lab Funct Components Res & Utiliz, Haikou 571101, Hainan, Peoples R China

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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