期刊
PHYTOCHEMISTRY
卷 64, 期 4, 页码 811-816出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2003.08.003
关键词
Xylopia vielana; Annonaceae; vielanins A-E; sesquiterpenoids; guaiane dimers
From the leaves of Xylopia vielana (Annonaceae) two dimeric guaianes named vielanins D and E were isolated and structurally elucidated by mass and NMR spectroscopy. Vielanin D and E consist of bridged ring systems formally representing the Diels-Alder products from the hypothetical guaiane-type monomers. Due to a hemiketal function at C-8' both compounds occurred as epimeric mixtures. (C) 2003 Elsevier Ltd. All rights reserved.
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