Phytochemistry

Synthesis of 5, 8-dihydroxy-6, 7-dimethoxyflavones and revised structures for some natural flavones

…, Y Kawamura, H Yamamoto, T Kitou, K Yamashita

Index: Horie, Tokunaru; Kawamura, Yasuhiko; Yamamoto, Hitoshi; Kitou, Takeshi; Yamashita, Kazuyo Phytochemistry (Elsevier), 1995 , vol. 39, # 5 p. 1201 - 1210

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Citation Number: 26

Abstract

Six 5, 8-dihydroxy-6, 7-dimethoxyflavones and three 8-hydroxy-5, 6, 7-trimethoxyflavones were synthesized from 2′, 5′-dihydroxy-3′, 4′, 6′-trimethoxyacetophenone by adapting the selective O-alkylation and dealkylation, and the differentiation between the flavones and their isomeric 6-hydroxyflavones was clarified by 1H NMR and UV spectra. Four natural flavones proposed as 5, 8-dihydroxy-6, 7-dimethoxyflavones, must have ...