Ochnaflavone and its derivatives: a new series of diflavonyl ethers from Ochna squarrosa Linn

Abstract

Ochnaflavone (4′,5,5″,7,7″-pentahydroxy-3′,4‴-oxydiflavone)(3) and its methyl ethers [(12) and (13)] isolated from the leaves of Ochna squarrosa Linn. (Ochnaceae), were identified from their spectral data and by synthesis of penta-O-methylochnaflavone (1). They are diflavonyl ethers linked via the two phenyl rings.