[A new flavonoid glycoside from Allium cepa L. var agrogatum Don].
OBJECTIVE
To investigate the chemical constituents from the bulb stems of the Chinese medicinal plant Allium cepa L. var. agrogatum Don.


METHODS
The crude extracts of the bulb stem were purified by Sephadex LH-20 chromatography. IR, UV, MS, 1H, 13CNMR, 1H-1H COSY, 1H-13C COSY and HMBC spectra were used to determine the structure of the isolated constituents.


RESULTS
A new compound named quercetin 3'-methoxy-4'-O-beta-D-glucopyranoside(I), together with three known compounds kaempferol(II), quercetin 4'-O-beta-D-glucopyranoside(III) and quercetin 3,4'-di-O-beta-D-glucopyranoside(IV) were isolated.


CONCLUSIONS
Quercetin 3'-methoxy-4'-O-beta-D-glucopyranoside(I) is a new compound, compounds II-IV were isolated from this plant for the first time.
Yang
X H
XH
Department of Medicinal Chemistry, College of Pharmaceutical Science, Norman Bethune University of Medical Sciences, Changchun 130021, China. yang.xh.cc.jl.cn@263.net
Liu
Y Y
YY
Liu
L J
LJ
Zhou
X P
XP
Toshio
S
S
D000490:Allium / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D044948:Flavonols; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D044949:Kaempferols; D011794:Quercetin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification*
D005419:Flavonoids; D044948:Flavonols; D005960:Glucosides; D006027:Glycosides; D044949:Kaempferols; C466504:quercetin 3'-methoxy-4'-O-glucopyranoside; C466505:quercetin 3,4'-di-O-glucopyranoside; C110310:quercetin 4'-O-glucopyranoside; C006552:kaempferol; D011794:Quercetin