Syntheses of lespedezaflavanone-B and amorilin
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Two naturally occurring benzopyranones, lespedezaflavanone-B and amorilin have been synthesised from the same chalcone. Prenylation of the chalcone using prenyl bromide affords mono- and di-prenylated chalcones which on cyclization followed by demethoxymethylation furnishes the respective benzopyranones.
Volume 135, 2023
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