Myricetin 5,7,3',4',5'-pentamethyl ether and other methylated flavonoids from Murraya paniculata

Article abstract of DOI:10.1016/S0031-9422(96)00853-9

Seven flavonoids, including one new flavonol, were isolated from the leaves of Murraya paniculata (Rutaceae). Four were identified as previously known constituents of M. paniculata or allied species, namely, 5,7,3',4',5'- pentamethoxyflavone, 5,7,8,3',4',5'-hexamethoxyflavone, 3,5,7,3',4',5'- hexamethoxyflavone and 3,5,7,8,3',4',5'-heptamethoxyflavone. The structure of the new flavonol was elucidated as 3-hydroxy-5,7,3',4',5'-pentamethoxyflavone on the basis of spectroscopic studies. Two other flavonoids, a methylated flavanone and its corresponding chalcone isomer were identified as 2-(S)- 5,7,3',4',5'-pentamethoxyflavanone and 2'-hydroxy-3,4,5,4',6'- pentamethoxychalcone, respectively.