Phytochemistry p. 1201 - 1210 (1995)
Update date:2022-08-05
Topics:
Horie, Tokunaru
Kawamura, Yasuhiko
Yamamoto, Hitoshi
Kitou, Takeshi
Yamashita, Kazuyo
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 other structures and three are shown to be isomeric 5,7-dihydroxy-6,8-dimethoxyflavones.A flavone, isolated from Helichrysum, is revised to the isomeric 7-hydroxy-5,6,7-trimethoxyflavone,
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Doi:10.1246/cl.1995.881
(1995)Doi:10.1021/es9607953
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(1988)
