Chemical Constituents of the Fruits of Pranus cerasifera

Five compounds were isolated and purified from the fresh fruits of Pranus cerasifera Ehrh f. by column chromatography on silica gel,ODS and Sephadex LH-20. Their structures were elucidated by IR,UV,1H NMR,13 C NMR,HMBC,HSQC spectral analyses. They were identified as 3-O-acetyl-protocatechuic acid( 1),2( R)-hydroxybutanedioic acid-1-methyl ester( 2),3,3',4,4'-Tetrahydroxybiphenyl( 3),β-daucosterol( 4) and Quercetin( 5). Compounds 1-4were isolated from this species for the first time and 1 was a new natural product. The1 H and13C NMR data of compound 1 were reported as well. All the isolated compounds were evaluated for their in vitro antioxidant activities using 2,2-diphenyl-1-picryhydrazyl( DPPH) radical scavenging assays. Compounds 3 and 5 showed potential antioxidant activities.