7Beta-oxygenated limonoids from Trichilia elegans ssp. elegans.
Five 7beta- and 7alpha-oxygenated obacunone-type limonoids were obtained on reinvestigation of the seeds of Trichilia elegans ssp. elegans: 7-deoxo-7beta-acetoxykihadanins A and B, 7-deoxo-7beta-hydroxykihadanins A and B and 7-deoxo-7alpha-hydroxykihadanin A, the last three being isolated after acetylation procedures as their mono- and/or diacetate derivatives. This is the first report of the natural occurrence of C-7 beta-substituted limonoids without any oxygenated function at C-6. The structures of these compounds have been established on the basis of 1D- and 2D-NMR spectral techniques, ESI-mass spectrum and X-ray crystallographic data.
Garcez
F R
FR
Departamento de Química, Universidade Federal de Mato Grosso do Sul, MS, Brazil. frgarcez@nin.ufms.br
Garcez
W S
WS
Roque
N F
NF
Castellano
E E
EE
Zukerman-Schpector
J
J
D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D010100:Oxygen / Q000737:chemistry*; D019685:Rosales / Q000737:chemistry*; D013057:Spectrum Analysis
D005419:Flavonoids; D010100:Oxygen