• Citer

Ichthyotoxic sesterterpenoids from the Neo-Guinean sponge Carteriospongia foliascens

par Braekman, Jean Claude ;Daloze, Désiré ;Kaisin, Michel ;Moussiaux, Barbara
Référence Tetrahedron, 41, page (4603-4614)
Publication Publié, 1985

Article révisé par les pairs

• Accès en ligne
• Détails
• Contenu
• Statistiques

Résumé :

Six 20,24-dimethylscalarane derivatives (5, 12, 15, 17, 19, and 21) have been isolated from the Neo Guinean sponge Carteriospongia foliascens. Compound 12 is identical with a C27 tetracyclic terpene previously isolated from an Australian specimen of the same sponge. The five other derivatives are new and their structures have been established on the basis of their spectral data. The structure of 5 was confirmed by single-crystal X-ray diffraction and that of 15 by chemical correlation with 12. The configuration at C-4 for all these compounds has been determined through 13C NMR data. Evidence leading to reverse the configuration at this centre in previously reported C27 tetracyclic terpenes is discussed. An ecological function is suggested for these molecules. © 1985.