Dichromenoxanthones from Tovomita brasiliensis.
Two dichromenoxanthones [1,6-dihydroxy-6',6'-dimethylpyrano(2',3':3,4)-6'',6''-dimethylpyrano(2'',3'':7,8)xanthone (brasilixanthone A) and 1,6-dihydroxy-6',6'-dimethylpyrano(2',3':2,3)-6'',6''-dimethylpyrano(2'',3'':7,8)xanthone (brasilixanthone B)], along with betulinic acid, friedelin, sitosterol and stigmasterol were isolated from the roots and stems of Tovomita brasiliensis. Their structures were characterized on the basis of 1H and 13C NMR spectral data, including 2D NMR experiments.
Marques
V L
VL
Departamento de Química, Universidade Federal de Alagoas, Maceió, Brazil.
De Oliveira
F M
FM
Conserva
L M
LM
Brito
R G
RG
Guilhon
G M
GM
D019684:Magnoliopsida / Q000737:chemistry*; D015394:Molecular Structure; D011714:Pyrans / Q000737:chemistry / Q000302:isolation & purification*; D013057:Spectrum Analysis; D014966:Xanthenes / Q000737:chemistry / Q000302:isolation & purification*; D044004:Xanthones
C421810:1,6-dihydroxy-6',6'-dimethylpyrano(2',3':2,3)-6'',6''-dimethylpyrano(2'',3'':7,8)xanthone; C421809:1,6-dihydroxy-6',6'-dimethylpyrano(2',3':3,4)-6'',6''-dimethylpyrano(2'',3'':7,8)xanthone; D011714:Pyrans; D014966:Xanthenes; D044004:Xanthones