An 8-hydroxylated external flavone and its 8-O-glucoside from Becium grandiflorum

Phytochemistry
R J Grayer, N C Veitch

Abstract

The major vacuolar flavonoid of a greenhouse-grown plant of Becium grandiflorum has been identified as the 8-O-glucoside of isothymusin (5,8,4'-trihydroxy-6,7-dimethoxyflavone), while the major external flavonoids in the diethyl ether surface wash of the same plant are found to be isothymusin and cirsimaritin (5,4'-dihydroxy-7,8-dimethoxyflavone). Although isothymusin is already known as a conversion product of thymusin (5,6,4'-trihydroxy-6,7-dimethoxyflavone) formed by means of the Wessely-Moser rearrangement, this is the first report of isothymusin as a plant constituent, both as aglycone and glycoside. The biogenetic and chemotaxonomic implications of the occurrence of these flavonoids in B.grandiflorum are briefly discussed.

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Citations

Apr 3, 2001·Phytochemistry·R J GrayerT Kokubun
Aug 29, 2001·Phytochemistry·M M Abou-ZaidN C Veitch
Jun 18, 2003·Phytochemistry·Roberto F VieiraAlan J Paton
Nov 28, 2002·Pharmacology & Therapeutics·Bent H Havsteen
May 24, 2008·Natural Product Reports·Nigel C Veitch, Renée J Grayer
Dec 24, 2011·Phytochemistry·Yu-wei SunPei-zhong Yu
Feb 5, 2021·Plants·Ninon G E R EtsassalaFelix Nchu

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