Three New Flavonoids and Antiallergic, Anti-Inflammatory Constituents from the Heartwood ofDalbergia odorifera

Three new flavonoids, (3R)-4′-methoxy-2′,3,7-trihydroxyisoflavanone (11), 7-methoxy-3,3′,4′,6-tetrahydroxyflavone (18), and 2′,7-dihydroxy-4′,5′-dimethoxyisoflavone (22), were isolated from the heartwood of Dalbergia odorifera T. Chen. (Leguminosae), together with twenty-two known compounds, (S)-4-methoxydalbergione (1), cearoin (2), medicarpin (3), formononetin (4), sativanone (5), 3-hydroxy-9-methoxy-coumestan (6), meliotocarpan A (7), isoliquiritigenin (8), stevein (9), liquiritigenin (10), 3′,4′,7-trihydroxyflavanone (12), butein (13), 3′-hydroxymelanettin (14), koparin (15), bowdichione (16), fisetin (17), melanettin (19), sulfuretin (20), 3′-hydroxydaidzein (21), 3′-O-methylviolanone (23), xenognosin B (24), and dalbergin (25). These flavonoids were evaluated in antiallergic and anti-inflammatory tests. The results showed that (S)-4-methoxydalbergione (1) and cearoin (2) exhibited antiallergic activity while (S)-4-methoxydalbergione (1), cearoin (2), butein (13), koparin (15), bowdichione (16), 3′-O-methylviolanone (23), and xenognosin B (24) showed significant anti-inflammatory activity.