Acetylation of 8-Bromo-5-hydroxy-6,7,4′-trimethoxyflavone |
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Authors: | E. K. Donbaeva V. I. Yamovoi B. I. Tuleuvov K. M. Turdybekov Yu. V. Gatilov S. M. Adekenov |
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Affiliation: | (1) Institute of Phytochemistry, Ministry of Education and Science of Kazakhstan, Karaganda, Kazakhstan;(2) Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia |
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Abstract: | 5-Hydroxy-6,7,4′-trimethoxyflavone was isolated from Centaurea pseudomaculosa Dobrocz., and its bromo derivative was obtained. The reaction of 8-bromo-5-hydroxy-6,7,4′-trimethoxyflavone with acetic anhydride in the presence of a catalytic amount of p-toluenesulfonic acid gave of a 73% 5-acetoxy-8-bromo derivative whose structure was established by X-ray diffraction.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 6, 2005, pp. 999–1001.Original Russian Text Copyright © 2005 by Donbaeva, Yamovoi, Tuleuvov, Turdybekov, Gatilov, Adekenov. |
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