[Chemical Constituents from Syzygium samarangense Branches and Leaves]

To investigate the chemical constituents from the branches and leaves of Syzygium samarangense.

The dried branches and leaves of Syzygium samarangense were powdered and extracted with 95% ethanol, then partitioned with petroleum ether, chloroform and ethyl acetate. The chloroform fraction was subjected to silica gel, Sephdex L-20 and preparative HPLC. The structures were identified by physicochemical properties and spectral data.

14 compounds were respectively isolated and identified as ursolic aldehyde(1), betulin(2), betulinic aldehyde(3), betulinic acid(4), lupeol(5), β-sitosterol(6), 5, 7-dihydroxy-6-methylflavanone(7), 2', 4'-dihydroxy-6'-methoxy-3'-methyldihydrochalcone (8), 2', 4'-dihydroxy-6'-methoxy-3'-methylchalcone (9), 5, 7-dihydroxy-6, 8-dimethylflavanone (10), 5, 7-dihydroxyflavanone (11), 2', 4'-dihydroxy-6'-methoxy-3', 5'-dimethyldihydrochalcone (12), 2'-hydroxy-4', 6'-dimethoxy-3'-methylchalcone(13) and p-hydroxyb6nzaldehyde(14).

Compounds 1 - 4 and 14 are isolated from this plant for the first time.