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Synthesis of the optically pure 5,5"-dihydroxy-7,7"-dimethoxy-8,8"-biflavone and its derivatives

【摘要】: <正> (±)-5,5"-Dihydroxy-7,7"-dimethoxy-8,8"-biflavone ((±)-l) was resolved into its opti-cally pure forms via the formation and recrystallization of its (2R)- and (2S)-l-(4-toluenesulfonyl)proly-late, and the methylated derivatives of (+)- and (-)-l were also prepared. The absolute configurations of all these 8,8"-biflavones have been confirmed by their CD spectra.

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