Phytochemistry p. 2362 - 2363 (1988)
Update date:2022-08-11
Topics:
Barron, Denis
Ibrahim, Ragai K.
Key Word Index-Flaveria chloraefolia; Compositae; ombuin 3-sulphate; flavonol sulphate.Abstract-One novel flavonoid sulphate ester and two known non-sulphated flavonoids were isolated from the leaves of Flaveria chloraefolia.The novel sulphated conjugate is 7,4'-dimethylquercetin (ombuin) 3-sulphate, and the known compounds are 6-methoxyquercetin and its 3-glucoside.The structure of ombuin 3-sulphate was established by UV spectroscopy, acid hydrolysis followed by EIMS of the aglycone, as well as enzymatic synthesis.
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