A New Chalcone from the Heartwood of Dalbergia cochinchinensis

A new compound, 2-(3-(4-hydroxyphenyl)-3-methoxypropyl)-5-methoxycyclohexa-2,5-diene-1,4-dione (1), was isolated from the heartwood of Dalbergia cochinchinensis along with 15 known compounds, 2,4-dihydroxy-5-methoxybenzophenone (2), 3,5-dimethoxy-4' -hydroxy-trans-stilbene (3), 7,8-dihydroxyflavanone (4), 2,3-dimethoxyxanthone (5), medicarpin (6), galangin (7), 5,7-dihydroxy-2',3',4'- trimethoxyisoflavanone (8), 6-hydroxy-2-(2-hydroxy-4-methoxyphenyl)-benzofuran (9), 3'-O-methylviolanone (10), 2',5,7-trihydroxy-4'-methoxyisoflavone (11), 7-hydroxy-6-methoxyflavone (12), formononetin (13), pterocarpol (14), 2'-hydroxyformonetin (15), and naringenin (16). Their structures were elucidated by spectroscopic means and comparison with published data. Compounds 1-5, 7-9, and 11 were isolated from Dalbergia L. for the first time, and compounds 1-11, 13, 15, and 16 were isolated from D. cochinchinensis for the first time.