Studies of the Selective O-Alkylation and Dealkylation of Flavonoids. IX. A New Method for Synthesizing 3, 5-Dihydroxy-7, 8-dimethoxyflavones from 3-Hydroxy-5, 7, 8-trimethoxyflavones

2-Hydroxy-3, 4, 6-trimethoxy-ω- (ρ-methoxybenzoyloxy) acetophenone was prepared from 2, 3, 4, 6-tetramethoxyacetophenone via the corresponding ω-bromoacetophenone. Cyclization of the acetophenone with ρ-methoxybenzoic anhydride by application of the Allan-Robinson reaction afforded 3-hydroxy-4'...

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Veröffentlicht in:	Chemical & pharmaceutical bulletin 1987/11/25, Vol.35(11), pp.4465-4472
Hauptverfasser:	HORIE, TOKUNARU, TSUKAYAMA, MASAO, KAWAMURA, YASUHIKO, YAMAMOTO, SHIGEO
Format:	Artikel
Sprache:	eng
Schlagworte:	3, 5-dihydroxy-7, 8-dimethoxyflavone 3-hydroxy-5, 7, 8-trimethoxyflavone 3-sulfonyloxy-5, 7, 8-trimethoxyflavone Allan-Robinson reaction aurone Chemistry Exact sciences and technology Heterocyclic compounds Heterocyclic compounds with o, s, se, te hetero atom and condensed derivatives Organic chemistry Preparations and properties selective demethylation tambulin ω-aroyloxyacetophenone
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