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| Cachet, N.; Regalado, E.L.; Genta-Jouve, G.; Mehiri, M.; Amade, P.; Thomas, O.P.. |
| The chemical composition of the Caribbean sponge Pandaros sp. was investigated and led to the isolation of seven new steroidal glycosides namely pandarosides A-D (1, 3, 4 and 6) along with the three methyl esters of pandarosides A, C, and D (2, 5 and 7). Their structures were characterized as 3β-[β-glucopyranosyl-(1→2)-β-glucopyranosyloxyuronic acid]-16-hydroxy- 5α,14β-poriferast-16-ene-15,23-dione (1) and its methyl ester (2), 3β-[β- glucopyranosyloxyuronic acid]-16-hydroxy-5α,14β-poriferast-16-ene-15,23-dione (3), 3β-[β- glucopyranosyl-(1→2)-β-glucopyranosyloxyuronic acid]-16-hydroxy-5α,14β-cholest-16-ene- 15,23-dione (4) and its methyl ester (5), 3β-(β-glucopyranosyloxyuronic acid)-16-hydroxy- 5α,14β-cholest-16-ene-15,23-dione (6) and its methyl ester... |
| Tipo: Journal Contribution |
Palavras-chave: Sponges; Sponges; Http://aims.fao.org/aos/agrovoc/c_7321. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3859 |
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| Cachet, N.; Genta-Jouve, G.; Regalado, E.L.; Mokrini, R.; Amade, P.; Culioli, G.; Thomas, O.P.. |
| Five new hydantoin alkaloids, named parazoanthines A-E (1-5), were isolated as the major constituents of the Mediterranean sea anemone Parazoanthus axinellae. Their structural elucidation was achieved through NMR spectroscopic and mass spectrometric analyses. The absolute configuration of the chiral compounds 1 and 4 was determined by comparison between experimental and TDDFT calculated CD spectra. The configuration of the trisubstituted double bond of 2, 3, and 5 was deduced from the 3JH6-C4 coupling constant value. This family of alkaloids represents the first example of natural 3,5- disubstituted hydantoins which do not exhibit a methyl at N-3. All compounds were tested for their natural toxicity (Microtox® assay) and parazoanthine C (3) exhibited the... |
| Tipo: Journal Contribution |
Palavras-chave: Alkaloids; Alkaloids; Http://aims.fao.org/aos/agrovoc/c_269. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3864 |
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| Regalado, E.L.; Jiménez-Romero, C.; Genta-Jouve, G.; Tasdemir, D.; Amade, P.; Nogueiras, C.; Thomas, O.P.. |
| Seven novel steroid glycosides, acanthifoliosides A-F (1-6) and the methyl ester of 6 (7), were isolated from the marine sponge Pandaros acanthifolium as minor components. Acanthifoliosides are characterized by a rare C-15 and C-16 oxidized D ring which was previously found in saponins produced by starfishes. Very uncommon is the presence of additional sugar residues at C-15 or C-16. Their structures were determined on the basis of extensive spectroscopic analyses, including two-dimensional NMR and HRESIMS data. The absolute configurations of the aglycones were assigned by comparison between experimental and TDDFT calculated CD spectra of 1, whereas the absolute configurations of the monosaccharide units were determined by chiral GC analyses of the acid... |
| Tipo: Journal Contribution |
Palavras-chave: Sponges; Sponges; Http://aims.fao.org/aos/agrovoc/c_7321. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/3866 |
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