Tetralones and flavonoids from Pyrola calliantha.
Two new tetralones, pyrolones A (1) and B (2), and a new flavonol glycoside, 2''-O-(4-hydroxybenzoyl)hyperin (3), were isolated from Pyrola calliantha (whole plant), together with six structurally related compounds, including 2''-O-galloylhyperin (4), hyperin (5), formononetin (6), quercetin 3-O-alpha-L-arabinopyranoside (7), quercetin 3-O-alpha-L-arabinofuranoside (8), and kaempferol 3-O-beta-D-galactopyranoside (9). The structures and absolute configurations of the new compounds were elucidated on the basis of spectroscopic (UV, ORD, CD, NMR) and mass-spectrometric (HR-ESI-MS) analyses.
Liu
Lei
L
School of Pharmaceutical Sciences, Peking University Health Science Center, No. 38 Xueyuan Road, Haidian District, Beijing 100083, PR China.
Li
An-Liang
AL
Zhao
Ming-Bo
MB
Tu
Peng-Fei
PF
D005419:Flavonoids / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D031828:Pyrola / Q000737:chemistry*; D044024:Tetralones / Q000737:chemistry*
D005419:Flavonoids; D044024:Tetralones