- Towards the preparation of synthetic outer membrane vesicle models with micromolar affinity to wheat germ agglutinin using a dialkyl thioglycoside
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A series of alkyl thioglycosides and alkyl thiodiglycosides bearing glucose and N-acetylglucosamine residues were prepared by thiol-ene coupling in moderate to good yields (40-85%). Their binding ability towards wheat germ agglutinin was measured by competitive enzyme-linked lectin assays. One of the synthetic compounds presenting two GlcNAc units showed the highest inhibitory effect of this study with an IC50 of 11 μM corresponding to a 3182-fold improvement compared to GlcNAc. These synthetic molecules were used to produce giant vesicles, alone or in mixture with phospholipids, mimicking bacterial outer membrane vesicles (OMV) with potential antiadhesive properties.
- Fayolle, Dimitri,Berthet, Nathalie,Doumeche, Bastien,Renaudet, Olivier,Strazewski, Peter,Fiore, Michele
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- Synthesis and surface properties of alkyl β?D?thioglucopyranoside
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Alkyl thioglycosides are a class of nonionic sugar-based sulfur-containing surfactants and bioreagents. The surfactants 1,2?trans alkyl β?D?thioglucopyranosides with different alkyl chain length (n = 6–12) were stereoselectively prepared by the Helferich method. Their properties including HLB number, logP value, water solubility, foam property, emulsifying property, surface property and thermotropic liquid crystal property were mainly investigated. The results showed that their HLB numbers and water-solubility decreased as the related logP values increased with increasing the alkyl chain length. Alkyl β?D?thioglucosides were already insoluble in water with n ≥ 10. Both β?D?thioglucopyranosides (n = 8, 9) reduced the surface tension of the related aqueous solution to nearly 29 mN·m?1 at the critical micelle concentration (CMC), they also had excellent foaming ability and foam stability. Nonyl β?D?thioglucopyranoside had good emulsifying properties for both n?octane/water system and toluene/water system. Alkyl β?D?thioglucopyranosides (n = 6–12) were observed to have the thermotropic liquid crystal properties.
- Wu, Xiubing,Chen, Langqiu,Fu, Fang,Fan, Yulin,Luo, Zhiqiang
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p. 282 - 289
(2018/12/13)
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- Preparation of S-glycoside surfactants and cysteine thioglycosides using minimally competent Lewis acid catalysis
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Here we report a method for the preparation of anomerically pure β-S-glycopyranosides (1,2-trans-glycosides) from the corresponding peracetate donors. S-glycosylation was performed in CHCl3 at reflux in the presence of a catalytic amount of InBr3. Deacylation of the intermediate peracetates were achieved under Zemplén conditions. Five pyranose examples, monosaccharides D-glucose and D-galactose and disaccharides cellobiose, maltose, and lactose, were used as donors, and five thiols including an α/ω dithiol and Fmoc-L-cysteine were used as acceptors. Melting points, high res MS, [α]D and NMR data (1H and 13C, including COSY, HSQC and HMBC) are reported for compounds not previously described.
- Szabó, Lajos Z.,Hanrahan, Dillon J.,Jones, Evan M.,Martin, Erin,Pemberton, Jeanne E.,Polt, Robin
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- Non-amphiphilic carbohydrate liquid crystals containing an intact monosaccharide moiety
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A chiral rigid moiety which forms the basis of a new class of non-amphiphilic carbohydrate liquid crystals has been developed. This moiety contains a fully intact glucopyranose ring embedded in a trans-decalin structure. The original carbohydrate is substituted so that only two hydroxyl groups are left, resulting in derivatives with reduced hydrophilicity. The substituents R and X-R′ on the 4,6-O-ylidene β-D-glucopyranoside are in the equatorial position and can be varied extensively, using straightforward synthetic procedures. Investigations as to the requirements for R and X-R′ for inducing liquid-crystalline behavior have shown that at least one of the substituents should contain a large, polarizable aromatic moiety. An aromatic Schiff base fulfils this requirement.
- Smits,Engberts,Kelogg,Van Doren
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p. 185 - 199
(2007/10/02)
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- Ampiphilic Carbohydrate-Based Mesogens, VI: Synthesis of a Series of Alkyl 1-Thio-D-glucopyranosides and Their Regioselective Reductions to 1-Alkylthio-1-deoxy-D-glucitols
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Alkyl 1-thio-α,β-D-glucopyranosides (hexyl to decyl, 1a-e) are prepared by reaction of penta-O-acetyl-β-D-glucopyranose with the respective thiols in the presence of diethylether-trifluoroborane, followed by deacetylation. 1a-e are converted into their tetra-O-diethylboryl derivatives 2a-e and reduced with ethyldiboranes(6) in the presence of the catalyst 9-methylsulfonyloxy-9-borabicyclononane (9-BBN-mesylate, MSBBN) to give the mesogenic 1-alkylthio-1-deoxy-D-glucitols 3a-e after deboronation.
- Dahlhoff, Wilhelm V.
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p. 1025 - 1027
(2007/10/02)
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- Synthesis of Alkyl-β-D-thioglucopyranosides, a Series of New Nonionic Detergents
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As a part of our search for new types of detergent useful for biological applications, a series of alkyl-β-D-thioglucopyranosides was synthesized in several steps from glucose.The overall yield was about 80percent.Critical micelle concentrations of n-hexyl-, n-heptyl-, n-octyl-, and n-nonyl-β-D-thioglucopyranoside were determined.Because of their electroneutrality, high solubility in water and high critical micelle concentration, n-heptyl- and n-octyl-β-D-thioglucopyranoside seem to be potentially useful detergents for applications in biological systems.
- Saito, Setsuo,Tsuchiya, Tomofusa
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p. 503 - 508
(2007/10/02)
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