An unusual homoisoflavanone and a structurally-related dihydrochalcone from Polygonum ferrugineum (Polygonaceae)

LOPEZ, SN; GONZALEZ SIERRA, M; GATTUSO, S; FURLAN, RLE; ZACCHINO, SA

PHYTOCHEMISTRY

Elsevier

Lugar: New York; Año: 2006 vol. 67 p. 2152 - 2158

0031-9422

The homoisoflavanone 5,7-dihydroxy-6-methoxy-3-(9-hydroxy-phenylmethyl)-chroman-4-one (1) and its structurally related 2,4-dihydroxy-3methoxy-a-hydroxymethyl-b-hydroxy-dihydrochalcone (2) along with the known chalcones 2,6-dihydroxy-3,4-dimethoxychalcone (pashanone) (3), 2,4-dimethoxy-6-hydroxychalcone (flavokawin B) (4) and 2,4-dihydroxy-6-methoxychalcone (cardamonin or alpinetin chalcone) (5) plus the known flavanones 5-hydroxy-7-methoxy-chroman-4-one (pinostrobin) (6) and 5,8-dimethoxy-7-hydroxy-chroman-4-one (7) were isolated from dry leaves of Polygonum ferrugineum (Polygonaceae). To our knowledge, this s the first report of the isolation of a homoisoflavanone from the Polygonum genus and he Polygonaceae family and could be an important chemotaxonomic finding. In addition, the pattern of substitution of this new homoisoflavanone is different from others previously reported.