Browsing by Author "Ferreira, Ana Margarida V. D."
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- Chemical constituents of Euphorbia hyberna L. (Euphorbiaceae)Publication . Ferreira, Ana Margarida V. D.; Carvalho, Maria João; Sequeira, Miguel M.; Silva, Artur M. S.; Carvalho, Luís H. M.Chemical investigation of the aerial part and the roots of Euphorbia hyberna L. subs. hyberna. resulted in the isolation and identification of four triterpenoids (3�-O-octadecanoyllupeol (1), glut-5-en-3�-ol (2), 24-methylenecicloartan-3�-ol (3) and cicloart-23-ene-3�,25-diol (6)) along with the phenolic compounds ellagic acid (4) and 3,30 -di-O-methylellagic acid (7). Although these are all known compounds, this is the first report of their isolation from this plant. Their structures were elucidated on the basis of spectral methods, including 2D NMR experiences, and confirmed by comparing with the literature data.
- Jatrophane and lathyrane diterpenoids from Euphorbia hyberna LPublication . Ferreira, Ana Margarida V. D.; Carvalho, Luı́s H. M.; Carvalho, Maria João M.; Sequeira, Miguel M.; Silva, Artur M. S.A new diterpene tetraester, from the jatrophane family, and two new diterpene triesters, with a lathyrane skeleton, have been isolated from the chloroform extract of the roots of Euphorbia hyberna L. The structures of these compounds have been established by spectroscopic methods, including 2D NMR experiments.