Phenolic Compounds from Portulaca oleracea and Their Cytotoxic Activity

【摘要】：正Five phenolic compounds(1-5)including four new homoisoflavanonoids,named portulacanones A-D(1-4),were isolated from the whole plants of Portulaca oleracea.Their structures were identified as 2′-hydroxy-5,7-dimethoxy-3-benzyl-chroman-4-one(1),2′-hydroxy-5,6,7-trimethoxy- 3-benzyl-chroman-4-one(2),5,2′-dihydroxy-6,7-dimethoxy-3-benzyl-chroman-4-one(3),5,2′- dihydroxy-7-methoxy-3-benzylidene-chroman-4-one(4)and 2,2′-dihydroxy-4′,6′-dimethoxy