| Abstract: | Centrifugal partition chromatography, Sephadex LH-20 and flash chromatography were applied to separate flavonoids and coumarins from Berchemia formosana. This first chemical investigation led to the isolation of ten compounds. Based on spectral analysis, they were determined to be quercetin ( 1 ), rutin ( 2 ), (+)-dihydroquercetin ( 3 ), (+)-dihydrokaempferol ( 4 ), naringenin ( 5 ), 2-hydroxy-naringenin ( 6 ), 2-hydroxy-naringenin-7-O-β-glucoside ( 7 ), (-)-catechin ( 8 ), (-)-gallocatechin ( 9 ) and scopoletin ( 10 ). Among these 7 is a novel natural product and was found to be composed of two inseparable diastereoisomers. The presence of the rare 2-hydroxyflavanones 6 and 7 in B. formosana is of interest for chemotaxonomy. |
