Abstract
Two new melampolide-type sesquiterpene lactones, 8β-epoxyangeloyloxy- 9α-ethoxy-14-oxo-acanthospermolide (1) and 8β-angeloyloxy-9α- ethoxy-14-oxo-acanthospermolide (2), were isolated from the leaves of yacon [Smallanthus sonchifolia (POEPP. et ENDL.) H. Robinson] along with eleven known melampolides, allo-schkuhriolide (3), enhydrin (4), polymatin A (5), fluctuanin (6), 8β-angeloyloxy-9α-acetoxy-14-oxo-acanthospermolide (7), 8β-angeloyloxy-14-oxo-acanthospermolide (8), 8β- methacryloyloxymelampolid-14-oic acid methyl ester (9), uvedalin (10), polymatin B (11), 8β-tigloyloxymelampolid-14-oic acid methyl ester (12), and sonchifolin (13). Their structures were established on the basis of spectroscopic evidence including 1D- and 2D-NMR experiments. All isolates were evaluated for inhibition of LPS-induced nitric oxide production in murine macrophage RAW 264.7 cells.
Original language | English |
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Pages (from-to) | 199-202 |
Number of pages | 4 |
Journal | Chemical and Pharmaceutical Bulletin |
Volume | 56 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2008 Feb |
Keywords
- Asteraceae
- Melampolide
- Nitric oxide production inhibitor
- Sesquiterpene lactone
- Smallanthus sonchifolius
- Yacon
ASJC Scopus subject areas
- Chemistry(all)
- Drug Discovery