Flavonoid Constituents of Acacia catechu

Ten compounds were isolated from the ethanolic extract of the leaves of Acacia catechu (Fabaceae), and their structures were identified as nine flavonoids ((+)-catechin (1), (-)- epicatechin (2), (+)-afzelechin (3), ()-epiafzelechin (4), (+)- mesquitol (5), kaempferol (6), quercetin (7), quercetin 3-methyl ether (8), and caryatin (9)) and an ellagic acid (10). The chemical structures of these compounds were identified on the basis of spectroscopic methods (mass spectrometry, 1D and 2D nuclear magnetic resonance) and comparison with literature values. This is the first time that the isolation of caryatin (9) has been reported from Acacia genus.