tailieunhanh - Contribution to the study on polar constituents from the buds of rhodomyrtus tomentosa (ait.) hassk. (myrtaceae)

A flavonol glycoside, kaempferol 3-O- -sambubioside (1) was isolated in a study on the polar constituents of the buds of Rhodomyrtus tomentosa Ait. Hassk. (Myrtaceae). Its structure was determined by spectroscopic methods. | Journal of Chemistry Vol. 45 6 P. 749 - 750 2007 CONTRIBUTION TO THE STUDy ON POLAR CONSTITUENTS FROM THE BUDS OF RHQDQMYRTUS TQMENTQSA AIT. HASSK. MyRTACEAE Received 28 August 2006 PHAN MINH GIANG TRAN THI HA NGUYEN THI HONG ANH PHAN TONG SON Laboratory of Chemistry of Natural Products Faculty of Chemistry College of Natural Science Vietnam National University Hanoi Vietnam SUMMARY A flavonol glycoside kaempferol 3-O-f-sambubioside 1 was isolated in a study on the polar constituents of the buds of Rhodomyrtus tomentosa Ait. Hassk. Myrtaceae . Its structure was determined by spectroscopic methods. Keywords Rhodomyrtus tomentosa Myrtaceae flavonol glycoside. Rhodomyrtus tomentosa Ait. Hassk. Myrtaceae 1 Vietnamese name Sim is a small shrub 1-2 m high. The plant occurs rather widely in Asian tropical and subtropical regions. In Vietnam R. tomentosa is extensively found in all the midland and low mountainous regions sometimes in higher mountains. Recently it has been grown in medicinal plant gardens at hospitals and village health-care stations for convenience of use. The young buds and leaves are collected in spring they are then sun-dried. The buds and young leaves of R. tomentosa are effective for treatment of abdominal pain diarrhoea and dysentery. They are used in the form of oral decoction. In external use the decoction of the leaves is used for lavage of wound 1 . Triterpenoids steroids 2 3 malvidin-3-glucoside 4 tannins 5 6 and flavone glycosides 7 were isolated from the leaves stems and flowers of R. tomentosa. Our study is the first report dealing with the buds of the plant. We investigated the n-BuOH-soluble fraction of the MeOH extract from the buds of R. tomentosa 8 and isolated a flavonol glycoside 9 . The 1H- and 13C-NMR spectra 10 showed the presence of a kaempferol glycoside 11 . The glycoside moiety was determined to be 3-O-P-D-xylopyranosyl- 1 2 -O-P-D-glucopyr anoside sambubioside on the basis of comparison of the1H- and 13C-NMR spectroscopic data

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