Journal
JOURNAL OF CARBOHYDRATE CHEMISTRY
Volume 22, Issue 2, Pages 109-122Publisher
TAYLOR & FRANCIS INC
DOI: 10.1081/CAR-120020481
Keywords
fucoidan fragments; synthesis; NMR; conformational analysis; NOE
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Propyl 4,4',4-tri-O-sulfated and non-sulfated (1 --> 3)-alpha-L-fucotriosides which are related to fragments of natural fucoidans have been synthesized. Their spectral and conformational properties have been investigated by H-1 and C-13 NMR, NOE and molecular modeling. Molecular mechanics calculations of the tri-O-sulfated compound as a trianion did not give agreement with the experimental NOE values, while the model with the non-dissociated sulfo group on the non-reducing end worked successfully. (1 --> 3)-Fucobioside fragments in both trisaccharides investigated were shown to have the same range of conformations as in previously described propyl (1 --> 3)-alpha-L-fucobiosides, but with the increase of the relative population of the conformer with the spatial proximity of H-1' and H-4 in the case of non-sulfated fucotrioside.
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