期刊
PHYTOCHEMISTRY
卷 103, 期 -, 页码 188-195出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2014.03.007
关键词
Alkaloid; Amaryllidaceae; Circular dichroism; Crinine-type; Hippeastrum; X-ray crystallography
资金
- Generalitat de Catalunya [2009 - SGR1060]
- CNPq (Brazil)
- Agencia Espanola de Cooperacion Internacional para el Desarollo (BECAS-MAEC-AECID)
An ongoing search for alkaloids in the Amaryllidaceae species using GC-MS resulted in the identification of two crinine-type alkaloids, aulicine (1) and 3-O-methyl-epimacowine, (2) from the indigenous Brazilian species Hippeastrum aulicum and Hippeastrum calyptratum, respectively. In addition, two alkaloids, 11-oxohaemanthamine (3) and 7-methoxy-O-methyllycorenine (4) were both isolated from H. aulicum. Furthermore, we provide here complete NMR spectroscopic data for the homolycorine analogues nerinine (5) and albomaculine (6). The absolute stereochemistry of the 5, 10b-ethano bridge in the crinine variants was determined by circular dichroism and X-ray crystallographic analysis, thus presenting the first direct evidence for the presence of crinine-type alkaloids in the genus Hippeastrum. (c) 2014 Elsevier Ltd. All rights reserved.
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