Macrolactone glycosides of three lichen acids from Acarospora gobiensis, a lichen of Central Asia

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• 作者：Rezanka ; Tomá ; &scaron ; Guschina ; Irina A.
• 关键词：Macrolactone glycoside esters ; Lichens of Central Asia ; Acarospora gobiensis ; Acarosporaceae ; NMR ; MS ; IR spectra
• 刊名：Phytochemistry
• 出版年：2001
• 出版时间：December, 2001
• 年：2001
• 卷：58
• 期：8
• 页码：1281-1287
• 全文大小：133 K

文摘

The compounds isolated from the extract of Central Asian lichen (Acarospora gobiensis H. Magn.) comprised three new glycosides having 18-hydroxy-dihydroalloprotolichesterinic, 18-hydroxy-neodihydroprotolichesterinic and 18-hydroxy-dihydroprotolichesterinic acids as aglycones and a di- or trisaccharide moiety linked at C-18 and at the carboxylic group. These compounds, called gobienines A–C, were found to be di- or trisacharides forming a macrolactone with the aglycone. The structures were elucidated by using extensive spectroscopic analysis (1D and 2D NMR, MS, IR and ORD) and chemical and enzymatic methods.