Calyculaglycosides D and E, novel cembrane glycosides from the Caribbean gorgonian octocoral Eunicea species and structural revision of the aglycon of calyculaglycosides A-C.
J Nat Prod
; 64(11): 1439-43, 2001 Nov.
Article
em En
| MEDLINE
| ID: mdl-11720528
A recent investigation of the constituents of Eunicea sp. from Colombia and Puerto Rico has provided two novel cembrane glycosides, calyculaglycosides D (6) and E (7), and a new cembranoid diterpene in free form, (+)-nephthenol (4). Metabolites 6 and 7 possess a glycosyl-fused cembrane skeleton with a 1S configuration. Biogenetic considerations have led to a revision of the previously assigned dilophol skeleton of calyculaglycosides A-C, which was confirmed by extensive 2D NMR investigation and a chemical degradation study. Consequently, the true structures for calyculaglycosides A-C are 8-10, respectively, not 1-3. This is the first report of the occurrence of marine diterpene glycosides having a cembrane aglycon.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cnidários
/
Diterpenos
/
Glicosídeos
Limite:
Animals
País/Região como assunto:
America do sul
/
Caribe
/
Colombia
/
Puerto rico
Idioma:
En
Revista:
J Nat Prod
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Estados Unidos
País de publicação:
Estados Unidos