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Non-polar flavonoids of Calycadenia, Lagophylla and Madia

1992; Elsevier BV; Volume: 31; Issue: 4 Linguagem: Inglês

10.1016/0031-9422(92)80273-h

1873-3700

Bruce A. Bohm, Charmaine Fong, Muriel Hiebert, Azim Jamal, William J. Crins,

Natural product bioactivities and synthesis

Several combinations of flavones, flavonols, flavanones, and dihydroflavonols have been identified from five species of Calycadenia and one species each of Madia and Lagophylla. In many instances the flavones and flavonols carry extra hydroxylation at positions-6 and/or -8 and are further characterized by moderately high levels of O-methylation. These observations are consistent with earlier findings for other members of the Madiinae (Asteraceae: Heliantheae). All compounds identified are known natural products, although a few are new in the subtribe differing from compounds described earlier by virtue of one or two additional methyl ether groups.