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1. (Article ID: 7993)
 
Rezanka T, Guschina IA
Glycosidic compounds of murolic, protoconstipatic and allo-murolic acids from lichens of Central Asia
Phytochemistry 54(6) (2000) 635-645
 

Eleven compounds isolated from the extract of the Central Asian lichens comprised eight new glycosides having murolic, protoconstipatic and allo-murolic acids, as the aglycones and a saccharide moiety linked at C-18 made up of one or two sugars (glucose and apiose or rhamnose or xylose or arabinose). The structures were elucidated by using extensive spectroscopic analysis (1D and 2D NMR, MS, IR, UV and CD) and chemical methods.

glycosides, lichens, murolic acid, glucore, Central Asia, aglycones

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2. (Article ID: 7995)
 
Rezanka T, Guschina IA
Glycoside esters from lichens of central Asia
Phytochemistry 58(3) (2001) 509-516
 

Ten compounds isolated from the extract of the central Asian lichens comprised new glycosides and glycoside esters having 18R-hydroxy-dihydroalloprotolichesterinic, 18S-hydroxy-dihydroprotolichesterinic and 18S-hydroxy-neodihydroprotolichesterinic acids, as the aglycones and a saccharide moiety linked at C-18 and also at C-21 made by glucose, xylose or rhamnose. The structures were elucidated using extensive spectroscopic analysis (1D and 2D NMR, MS, IR, UV and ORD) and by biochemical methods.

NMR, MS, glycoside esters, lichens of central Asia, IR, ORD, UV

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3. (Article ID: 7996)
 
Rezanka T, Guschina IA
Macrolactone glycosides of three lichen acids from Acarospora gobiensis, a lichen of Central Asia
Phytochemistry 58(8) (2001) 1281-1287
 

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.

NMR, MS, IR spectra, lichens of central Asia, macrolactone glycoside esters, Acarospora gobiensis, Acarosporaceae

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4. (Article ID: 8369)
 
Rezanka T, Guschina IA
Further glucosides of lichens' acids from Central Asian lichens
Phytochemistry 56(2) (2001) 181-188
 

Eight compounds isolated from an extract of Central Asian lichens comprised new glucosides having murolic, protoconstipatic and allo-murolic acids as the aglycones and a saccharide moiety linked at C-18 made up of four glucoses. The structures were elucidated using extensive spectroscopic analysis (1D and 2D NMR, MS, IR, UV and CD) and by chemical methods

lichens, glucosides, Central Asia, lichens' acids

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