Two new homoisoflavones fromPortulaca oleraceaL. and their activities

Two new compounds, identified as 3-(2-hydroxybenzyl)-6,8-dimethoxy-4H-chromen-4-one (1), named oleracone J and 3-(2-hydroxybenzyl)-6,8-dimethoxychroman-4-one (2), named oleracone K, were isolated fromPortulaca oleraceaL., and the structures of them were determined by spectroscopy, including one-dimensional and two-dimensional nuclear magnetic resonance, high-resolution electrospray ionisation time-of-flight mass spectrometry. The two compounds have scavenging activities in 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical quenching assay, with IC(50)values of 18.34, 23.92 mu M, and anticholinesterase activities with IC(50)values of 59.08, 67.89 mu M, respectively.