A new, efficient, and general semisynthesis of hydnocarpin-type flavonolignans was developed and optimized, enabling gram-scale production of hydnocarpin D (2). Moreover, the syntheses of optically pure hydnocarpin isomers [(10R,11R)-hydnocarpin (1a), (10R,11R)-hydnocarpin D (2a), and
Flavonolignans are plant natural products, composed of a flavonoid moiety and a lignan (phenylpropanoid) part. Current literature focuses on flavonolignans formed from taxifolin and coniferyl alcohol as e.g. silybin and its congeners from fruit extract from the purple variety of the milk thistle
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