A new chromone derivative from Berchemia lineata

To study the chemical constituents from the root of Berchemia lineata (L.) DC., nine compounds were isolated from the EtOAc extract by using silica gel, RP-C18 silica gel column chromatography and preparative HPLC.  Based on the spectroscopic analysis, their structures were identified as 5-hydroxy-7-(2'-hydroxypropyl)- 2-methyl-chromone (1), (−)-(1'R, 2'S)-erythro-5-hydroxy-7-(1', 2'-dihydroxypropyl)-2-methyl-chromone (2), naringenin (3), eriodictyol (4), (+)-aromadendrin (5), (+)-taxifolin (6), (+)-catechin (7), (+)-epigallocatechin   (8) and quercetin (9).  Among them, compound 2 is a new chromone derivative.  Compound 1 is a known chromone derivative and isolated from this genus for the first time.  Compounds 3−9 are known flavonoids and isolated from this plant for the first time.