3-Isoprenylated flavone

Flavonoids Flavonoids Flavonoid glycosides Isoprenylated flavones... 

Syah, Y.M. et al., Artoindonesianins Q-T, four isoprenylated flavones from Artocarpus champeden Spreng. (Moraceae), Phytochemistry, 61, 949, 2002. 

Hano, Y. et ak. Components of the root bark of Morus insignins. 3. Structures of three new isoprenylated xanthones morusignins I, J and K and an isoprenylated flavone morusignin L., Heterocycles, 36, 1359, 1993. 

Aida, M., Constituents of the Moraceae plants. Part 16. Artonins J, K, and L, three new isoprenylated flavones from the root bark of Artocarpus heterophyllus Lamk, Heterocycles, 36, 575, 1993. 

Fujimoto, T., Y. Hano, T. Nomura, and J. Uzawa Constituents of the Cultivated Mulberry Tree. XVIII. Components of Root Bark of Cndrania tricnspidata 2. Structures of Two New Isoprenylated Flavones, Cudraflavones A and B. Planta medica 50, 161 (1984). 

The various flavones that have been reported in wood or bark of higher plants are listed in Table 7.5.1 under five headings simple flavones, C-methylflavones, isoprenylated flavones, flavone O-glycosides, and C-glycosylflavones. Only a small number of simple hydroxyflavones (or their O-methyl ethers) are recorded. They are only regularly reported as heartwood constituents of Finns and Prunus. 

A related series of isoprenylated flavones occur in the bark of Morus species (Table 7.5.2) one of which, mulberrin, only differs from norartocarpin in the position of one the exocyclic double bonds. Again, cyclized derivatives of mulberrin occur, the tetracyclic cyclomulberrin and mulberrochromene and the pentacyclic... 

Morusin (3), a flavone derivative, isolated from the root bark of Morus alba L., as a main isoprenylated flavonoid, has a structure bearing an isoprenoid moiety at the C-3 position and a 2, 4 -dioxygenated pattern in the B ring [15]. These features are one of the characteristics of the isoprenylated flavonoids of Morus root bark. 

Flavones. Flavone structural variation derives from hydroxylation, O-methylation and O-glycosylation. In addition, there can be C6- and C8-linked C-glycosides, isoprenyl (isopen-tenyl, Cj) substituents and G G or C-O—C links to form biflavones. Methylation of the phenolic OHs decreases polarity to permit an external location such as in the waxy leaf or fruit surface. 

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