[Two new flavones from Fordia cauliflora of Yunnan].
OBJECTIVE
To study the chemical constituents of the stem of Fordia cauliflora of Yunnan province.


METHODS
The constituents were separated and purified by repeated silica column chromatography. The structures were elucidated by physical-chemical properties and spectroscopic data.


RESULTS
Six compounds were isolated from the ethanol extract of the stem of Fordia cauliflora. They were identified as: 6-hydroxy-3-methoxy-6",6"-dimethylchromeno-(2", 3" : 7, 8)-flavone (1), 3-methoxy-6-(3-methyl-but-2-enyloxy)-6", 6"-dimethylchromeno-( 2", 3" : 7, 8)-flavone (2), 3, 6-dimethoxy-6", 6"-dimethylchromeno-( 2", 3" : 7, 8)-flavone (3), 7-hydroxy-4'-methoxyisoflavone (4), 7, 4'-dihydroxyisoflavone (5) and karanjin (6).


CONCLUSIONS
Compounds 1 and 2 are new compounds. Compounds 3 -5 were isolated from the plant for the first time.
Liang
Zhi-Yuan
ZY
Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang 550002, China.
Yang
Xiao-Sheng
XS
Zhu
Hai-Yan
HY
Hao
Xiao-Jiang
XJ
D007887:Fabaceae / Q000737:chemistry*; D047309:Flavones / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*
C525384:3,6-dimethoxy-6'',6''-dimethylchromeno(2'',3''-7,8)flavone; C525383:3-methoxy-6-(3-methylbut-2-enyloxy)-6'',6''-dimethylchromeno(2'',3''-7,8)flavone; C525382:6-hydroxy-3-methoxy-6'',6''-dimethylchromeno(2'',3''-7,8)flavone; D047309:Flavones