Add time:09/01/2019         Source:sciencedirect.com

Seven 3,5-dihydroxy-7,8-dimethoxyflavones were synthesized from the corresponding 3,5,7,8-tetramethoxyflavones using selective demethylation and protection of 3- or 5- methoxy group, and their properties were clarified by the UV and 1H NMR spectral data. The structures of the four natural flavones were revised as follows: the three flavones, isolated from Heteromma simplicifolium, are 5,7-dihydroxy-3,8,3′,4′-tetramethoxyflavone, 5,7-dihydroxy-3,8,3′,4′,5′-pentamethoxyflavone, and 5,7,4′-trihydroxy-3,8,3′-trimethoxyflavone, respectively; the flavone glycoside, isolated from Rudbeckia bicolor, is proposed to be 3,5,4′-trihydroxy-6,7-dimethoxyflavone 3-rhamnoside.

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