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ombuin
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Ombuin is an O-methylated flavonol, a type of flavonoid. It is the 4',7-O-methyl derivative of quercetin.
Ombuin can be found in species of the genus ''Erythroxylum''. It can also be synthetized.〔(Partial methylation of quercetin: Direct synthesis of tamarixetin, ombuin and ayanin. Koppaka V. Rao, Jacob A. Owoyale, Journal of Heterocyclic Chemistry, Volume 13 Issue 6, Pages 1293 - 1295 )〕 Ombuin 3-sulfate can be isolated from ''Flaveria chlorifolia''.〔Ombuin 3-sulphate from Flaveria chloraefolia. Denis Barron and Ragai K. Ibrahim, Phytochemistry, Volume 27, Issue 7, 1988, pages 2362-2363, 〕
== Glycosides ==
Ombuin-3-rutinoside can be isolated from ''Phytolacca dioica'', the ombu tree.〔(Über die Synthese von Quercetin-3-glykosiden, II. Synthese des Ombuosids und eine rationelle Synthese von Rutin. Ludwig Hörhammer, Hildebert Wagner, Hans-Günther Arndt, Gustav Hitzler, Lorand Farkas, Chemische Berichte, Volume 101 Issue 4, Pp 1183-1185, 1968 ) (German)〕 Ombuin-3-O-rhamnosylglucoside can be found in ''Erythroxylum rufum''.〔Flavonoids of Erythroxylum rufum and Erythroxylum ulei. Bruce A. Bohm, David W. Phillips and Fred R. Gander, J. Nat. Prod., 1981, volume 44, issue 6, pages 676–679, 〕
Other glycosides (ombuosides) :
* Ombuin 3-galactoside (C23H24O12, CAS number 69168-13-4)
* Ombuin 3-glucoside (C23H24O12, CAS number 158642-42-3)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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