A New Benzofuran from the Heartwood of Dalbergia odorifera T. Chen and Its Protective Effect on Hypoxia/Reoxygenation Injury in H9c2

A new benzofuran, named as (2S,3S)-5,6-dimethoxy-3-methyl-2-(3'-hydroxyphenyl)-2,3-dihydrobenzofuran (1) , along with the six known isoflavonoids, 2 '-hydroxy-4 ',7-dimethoxyisoflavone (2) , 2 '-methoxybiochanin A (3) , tectorigenin (4) , calycosin (5) , 7-hydroxy-2 ',4 ',5 '-trimethoxyisoflavone (6) , orobol (7) were isolated from the heartwood of Dalbergia odorifera T.Chen. The structure of compounds was characterised by NMR spectroscopic data and comparisons with relevant literature data. The absolute structural configuration of compound 1 was determined through X-ray single crystal diffraction. Moreover, compounds 1-7 have no significant cytotoxic effects on H9c2 cells (IC50 > 200 mu M). Compound 1-7 exhibit a significant protective effect against H/R (hypoxia/reoxygenation) induced H9c2 cell damage at 10-40, 5-40, 5-40, 5-40, 5-40, 5-40 and 5-10 mu M (P < 0.05).