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pubmed-article:11454351pubmed:abstractTextTwo benzophenones, hypericophenonoside (1) and annulatophenone (2) were isolated from the methanol extract of the herb of Hypericum annulatum. The structures of the benzophenones were established as 2'-O-beta-D-glucopyranosyl-2,4,5',6-tetrahydroxy benzophenone (1) and 2,3',5',6-tetrahydroxy-4-methoxybenzophenone (2) based on spectral and chemical evidence. Hypericophenonside is the second benzophenone O-glycoside found in nature. Acid and enzymatic hydrolysis of (1) led directly to the formation of 1,3,7-trihydroxyxanthone (gentisein). This fact confirmed the hypothesis that some xanthones could be formed in plants by dehydration of 2,2'-dihydroxybenzophenones, and the intermediate precursors appear to be benzophenone O-glycosides ortho to the carbonyl function.lld:pubmed
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pubmed-article:11454351pubmed:authorpubmed-author:KitanovG MGMlld:pubmed
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pubmed-article:11454351pubmed:volume57lld:pubmed
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pubmed-article:11454351pubmed:pagination1237-43lld:pubmed
pubmed-article:11454351pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:11454351pubmed:year2001lld:pubmed
pubmed-article:11454351pubmed:articleTitleBenzophenone O-glucoside, a biogenic precursor of 1,3,7-trioxygenated xanthones in Hypericum annulatum.lld:pubmed
pubmed-article:11454351pubmed:affiliationDepartment of Pharmacognosy, Faculty of Pharmacy, Medical University of Sofia, Dunav str. 2, 1000, Sofia, Bulgaria. gkitanov@mbox.pharmfac.acad.bglld:pubmed
pubmed-article:11454351pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11454351pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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