[Studies on the chemical constituents from Rhododendron delavayi].
Maneno muhimu
Kikemikali
OBJECTIVE
To study the chemical constituents of the leaves from Rhododendron delavayi.
METHODS
The compounds were isolated and purified using column chromatography with silical gel and Sephadex LH-20, and their structures wer identified by their physical and spectral data.
RESULTS
Eight compounds were isolated and elucidated as 3',4',7-trihydroxy-3,5-dimethoxyflavone (1), 3',4',5,7-tetrahydroxy-3-methoxyflavone(2), quercetin-3-O-beta-D-arabinopyranoxide(3), catechin(4), epicatechin (5), epicatechin-(2beta-->O-->7,4beta-->8)-ent-epicatechin(6), (2S)-4-(3,4-dihydroxyphenyl) -2-butanol(7), (3,4-dihydroxyphenyl)-2-ethanol(8).
CONCLUSIONS
Compounds 2,3,6,7,8 are isolated from this plant for the first time.