Stereocontrolled syntheses of model compounds related to a major antigenic epitope against antibupleurum 2IIc/PG-1-IgG from antiulcer pectic polysaccharide are described. A trisaccharide derivative (13) was prepared as a precursor and a novel and simple approach for the rational design of a glycocluster and glycodendrimer was developed, through the syntheses of the fluorescence-labeled glycocluster (2) and glycodendrimer (3).
Synthesis of a novel glycosphingolipid from the millipede, Parafontaria laminata armigera, and the assembly of its carbohydrate moiety into multivalent structures
作者:Noriyasu Hada、Yoshiko Sonoda、Tadahiro Takeda
DOI:10.1016/j.carres.2006.04.019
日期:2006.7
A novel glycosphingolipid, beta-D-Manp-(1 -> 4)-[alpha-L-Fucp-(1 -> 3)]-beta-D-Glcp-(1 -> 1)-Cer, found in the millipede, Parafontaria laminata armigera, and multivalent derivatives of its carbohydrate moiety were synthesized. As the key step, the target glycolipid (1) was obtained through an inversion reaction at the 2-position of a beta-glucopyranoside residue yielding a P-mannopyranoside. In addition, the synthesis of fluorescently labeled trimer and tetramer glycoconjugates (2, 3) was achieved by iterative amide bond formation using a monomer unit (24). (c) 2006 Elsevier Ltd. All rights reserved.
Syntheses of new peptidic glycoclusters derived from β-alanine: di- and trimerized glycoclusters and glycocluster–clusters
作者:Koji Sato、Noriyasu Hada、Tadahiro Takeda
DOI:10.1016/j.carres.2006.02.015
日期:2006.5
Fluorescence-labeled glycoclusters I and 2 have been synthesized to elongate glycocluster units that contain beta-alamine derivative 6 and sugar unit 7. Similarly, di- and trimerized glycoclusters 3 and 4 have been obtained by coupling glycocluster 17 with succinyl chloride and/or trimesoyl chloride, respectively. Furthermore, glycocluster-cluster 5 was also synthesized by a convergent growth approach. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis of new peptidic glycoclusters derived from β-alanine
作者:Koji Sato、Noriyasu Hada、Tadahiro Takeda
DOI:10.1016/j.tetlet.2003.10.073
日期:2003.12
The synthesis of an asymmetric glycocluster 1 has been achieved by coupling of a sugar unit with the β-alanine polypeptide, the principal chain, and combining a carbohydrate chain with the side chain causing it to branch from the N terminal. The synthesis of this side chain multivalent ligands is based on the scaffolding of some ω-amino acid (glycine, β-alanine, and GABA) derivatives. This method facilitated