177897-25-5

Upstream product

• 22529-61-9 (1R)-1-((3aR,6S,6aR)-6-(benzyloxy)-2,2-dimethyltetrahydrofuro(2,3-d)(1,3)dioxol-5-yl)ethane-1,2-diol 
• 75-36-5 acetyl chloride 
• 108-24-7 acetic anhydride 
• 177897-32-4 Acetic acid (R)-1-((3aR,5R,6S,6aR)-6-benzyloxy-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-2-(tert-butyl-dimethyl-silanyloxy)-ethyl ester 
• 106445-04-9 1-(6-benzyloxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)-2-(tert-butyldimethylsiloxy)ethanol 

Downstream Products

• 84563-90-6 6-O-acetyl-3-O-benzyl-1,2-O-isopropylidene-5-O-methanesulfonyl-α-D-glucofuranose 
• 263916-91-2 6-O-acetyl-3-O-benzyl-1,2-O-isopropylidene-5-O-(β-p-toluenesulfonyloxyethyl)-α-D-glucofuranose 
• 263916-93-4 Toluene-4-sulfonic acid 2-[(R)-2-hydroxy-1-((3aR,5S,6S,6aR)-6-hydroxy-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-ethoxy]-ethyl ester 
• 263916-90-1 6-O-acetyl-3-O-benzyl-5-O-(β-hydroxyethyl)-1,2-O-isopropylidene-α-D-glucofuranose 
• 263916-89-8 6-O-acetyl-3-O-benzyl-1,2-O-isopropylidene-5-O-(prop-2'-enyl)-α-D-glucofuranose 

Relevant academic research and scientific papers

Synthesis of heparin oligosaccharides and their interaction with eosinophil-derived neurotoxin

A convenient route for the synthesis of heparin oligosaccharides involving regioselective protection of d-glucosamine and a concise preparation of rare l-ido sugars from diacetone α-d-glucose is described. Stereoselective coupling of a d-glucosamine-derived trichloroacetimidate with a 1,6-anhydro-β-l-idopyranosyl 4-alcohol gave the desired α-linked disaccharide, which was used as repeating unit for dual chain elongation and termination. Stepwise assembly from the reducing to the non-reducing end with a d-glucosamine-derived monosaccharide as starting unit furnished the oligosaccharide skeletons having different chain lengths. A series of functional group transformations afforded the expected heparin oligosaccharides with 3, 5 and 7 sugar units. Interaction of these oligosaccharides with eosinophil-derived neurotoxin (EDN), a cationic ribonuclease and a mediator produced by human eosinophils, was further investigated. The results revealed that at 5 μg mL-1, the heptasaccharide has sufficiently strong interference to block EDN binding to Beas-2B cells. The tri- and pentasaccharides have moderate inhibitory properties at 50 μg mL-1 concentration, but no inhibition has been observed at 10 μg mL-1. The IC50 values of the tri-, penta- and heptasaccharides are 69.4, 47.2 and 0.225 μg mL-1, respectively.

Synthesis of 5-O-β-iodoethyl-D-glucofuranose

The preparation of an iodinated derivative of D-glucose where a β-iodoethyl moiety has been introduced at O-5 is presented. In such an analogue the existence of pyranose forms is precluded and the iodinated tag lies in a region of the carbohydrate not jud

Preparation of sugar-derived α-acetoxy-aldehydes

A convenient method for conversion of sugar diols (2a-2d) into a-acetoxy-aldehydes: 5-O-acetyl-3-O-benzyl-1,2-O-isopropylidene-α-D-glucofuranos-6-ulose (5a), 5-O-acetyl-3-O-benzyl-1,2-O-isopropylidene-α-D-allofuranos-6-ulose (5b), methyl 6-O-acetyl-2,3,4-tri-O-benzyl-D-glycero-α-D-gluco- and L-glycero-α-D-gluco-heptopyranosid-7-uloses (5c and 5d respectively) is presented. This involves the protection (as TBDMS ether) of the primary hydroxyl group, acetylation of the remaining secondary one and desilylation followed by a Swern oxidation. Partial migration of the acetyl group during desilylation (with Bu4NF) was observed for compound 4a and complete migration for 4f. α-Acetoxy-aldehydes 5a-5d were characterized as adducts with Ph3P = CH-CO2Me (12a-12d).