Flavonoids in root bark of Pongamia pinnata

摘要: Abstract Further investigation of the flavonoid constituents Pongamia pinnata from Japan resulted in isolation 18 compounds including nine new ones, ponganones III–XI, its root bark. The structures were determined to be (2 S )-3′,4′-dimethoxy-6″,6″-dimethylpyrano[2″,3″:7,8]-flavanone (III), )-6,3′,4′-trimethoxy-6″,6″-dimethylpyrano[2″,3″:7,8]-flavanone (IV), )-7-methoxy-6- O -γ,γ-dimethylallyl-3′,4′-methylenedioxyflavanone (V), 2′-hydroxy-3,4,5′-trimethoxy-6″,6″-dimethylpyrano[2″,3″:4′,3′]chalcone (VI), 2′,4′-dimethoxy-3,4-methylenedioxydioxydihydrochalcone (VII), 2′,5′,β-trimethoxy-3,4-methylenedioxy-6″,6″-dimethylpyrano[2″,3″:4′,3′]dihydrochalcone (VIII), 2,β-dimethoxy-3,4-methylenedioxy-furano[2″,3″:4′,3′]-dihydrochalcone (IX), β-hydroxy-2′,4′,6′-trimethoxy-3,4-methylenedioxychalcone (X) and 3-methoxy-furano-[2″,3″:7,6]flavone (XI), respectively, by means spectral analysis synthesis.