23846-69-7

Upstream product

• 108-24-7 acetic anhydride 
• 536-11-8 gentibiose 
• 74808-10-9 2,3,4,6-tetra-O-acetyl-d-glucopyranosyl trichloroacetimidate 
• 65620-65-7 1,2,3,4-tetra-O-acetyl-D-glucopyranose 
• 2280-44-6 D-Glucose 
• 13299-20-2 melibiose 
• 536-11-8 D-melibiose 
• 3947-62-4 2,3,4,5-tetra-O-acetyl-D-glucopyranose 
• 83-87-4 D-glucose pentaacetate 
• 54325-28-9 6-O-trityl-D-glucopyranose 
• 74808-10-9 O-(2,3,4,6-Tetra-O-acetyl-α-D-glucopyranosyl)trichloroacetimidate 

Downstream Products

• 1022927-00-9 (+)-menthyl 6-O-[4,6-bis-O-(4-bromobenzoyl)-β-D-glucopyranosyl]-β-D-glucopyranoside 
• 1022927-05-4 (-)-menthyl 6-O-[4,6-bis-O-(4-bromobenzoyl)-β-D-glucopyranosyl]-β-D-glucopyranoside 
• 1022927-17-8 tert-butyl 6-O-[4,6-bis-O-(4-bromobenzoyl)-β-D-glucopyranosyl]-β-D-glucopyranoside 
• 1022927-33-8 (+)-menthyl 2,3,4-tri-O-acetyl-6-O-[2,3-di-O-acetyl-4,6-bis-O-(4-bromobenzoyl)-β-D-glucopyranosyl]-β-D-glucopyranoside 
• 1379664-82-0 (+)-menthyl 2,3,4-tri-O-acetyl-6-O-(2,3-di-O-acetyl-β-D-glucopyranosyl)-β-D-glucopyranoside 
• 1379664-83-1 (-)-menthyl 2,3,4-tri-O-acetyl-6-O-(2,3-di-O-acetyl-β-D-glucopyranosyl)-β-D-glucopyranoside 
• 1448810-91-0 m-formyl-p-hydroxy-benzyl-2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl-(1→6)-2,3,4-tri-O-acetyl-1-thio-β-D-glucopyranoside 
• 1448810-97-6 m-formyl-p-hydroxy-benzyl-β-D-glucopyranosyl-(1→6)-1-thio-β-D-glucopyranoside 
• 137451-28-6 Acetic acid (2S,3R,4S,5R,6R)-3,5-diacetoxy-2-phenylsulfanyl-6-((2S,3R,4S,5S,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxymethyl)-tetrahydro-pyran-4-yl ester 
• 337903-61-4 benzyl N-diphenylmethylene-O-(2,3,4,2',3',4',6'-hepta-O-acetyl-β-melibiosyl)-L-serinate 

Relevant academic research and scientific papers

Synthesis of glycolipid analogs via highly regioselective macrolactonization catalyzed by lipase

Highly regioselective lipase catalyzed macrolactonization has been used in synthesizing first feedstock based glycolipid analogs. These macrolides containing common disaccharides maltose (4-O-α-d-glucopyranosyl-β-d-glucose) and melibiose (6-O-α-d-galactopyranosyl-β-d-glucose) were synthesized by employing chemoenzymatic methodologies. Maltose and Melibiose were coupled with methyl 15-hydroxy pentadecanoate and then subjected to a highly regioselective macrolactonization at the C-6″ position using Candida antarctica lipase-B to yield the desired products.

Regioselective silyl/acetate exchange of disaccharides yields advanced glycosyl donor and acceptor precursors

Glycoconjugates are composed of carbohydrate building blocks linked together in a multitude of ways giving rise to diverse biological functions. Carbohydrates are especially difficult to synthetically manipulate because of the similar reactivity of their numerous and largely equivalent hydroxyl groups. Hence, methodologies for both the efficient protection and selective modification of carbohydrate alcohols are considered important synthetic tools in organic chemistry. When per-O-TMS protected mono- or disaccharides in a mixture of pyridine and acetic anhydride are treated with acetic acid, regioselective exchange of silicon for acetate protecting groups occurs. Acid concentration, thermal conditions, and microwave assistance mediate the silyl/acetate exchange reaction. Regiocontrol is achieved by limiting the equivalents of acetic acid, and microwave irradiation hastens the process. We coined the term Regioselective Silyl Exchange Technology (ReSET) to describe this process, which essentially sets the protecting groups anew. To demonstrate the scope of the reaction, the conditions were applied to lactose, melibiose, cellobiose, and trehalose. ReSET provided rapid access to a wide range of orthogonally protected disaccharides that would otherwise require multiple synthetic steps to acquire. The resulting bifunctional molecules are poised to serve as modular building blocks for more complex glycoconjugates.

Deuterium labelling to extract local stereochemical information by VCD spectroscopy in the C-D stretching region: A case study of sugars

Stereochemical elucidation of molecules with multiple chiral centers is difficult. Even with VCD spectroscopy, excluding all but one diastereomeric structural candidate is challenging because the stereochemical inversion of one chiral center among many centers does not always result in noticeable differences in their VCD spectra. This work demonstrates that the introduction of a suitable VCD chromophore with absorption in the 2300-1900 cm-1 region can be used for extracting local stereochemical information and for the stereochemical assignment of the C-1 position of various sugars as a case study. Through studies on a series of epimeric pairs of monosaccharides and their derivatives, we found that the introduction of one -OCD3 group to each C-1 position produced almost mirror-image VCD patterns in the 2300-1900 cm-1 region depending on the C-1 stereochemistry irrespective of the other molecular moieties. This work also shows that comparison of the observed VCD signals and the calculated ones enables the stereochemical assignment of a chiral center in the vicinity of the chromophore. This study provides a proof of concept that the use of a VCD chromophore in the 2300-1900 cm-1 region enables the analysis of selected stereochemistry of suitable molecular systems. Further studies on this concept should lead to the development of a method useful for the structural elucidation of other types of complex molecules.

Rapid assembly of the doubly-branched pentasaccharide domain of the immunoadjuvant jujuboside A: Via convergent B(C6F5)3-catalyzed glycosylation of sterically-hindered precursors

A convergent synthesis of the complex, doubly-branched pentasaccharide domain of the natural-product immunoadjuvant jujuboside A is described. The key step is a sterically-hindered glycosylation reaction between a branched trisaccharide trichloroacetimida

Characterization of Protonated Model Disaccharides from Tandem Mass Spectrometry and Chemical Dynamics Simulations

The fragmentation mechanisms of prototypical disaccharides have been studied herein by coupling tandem mass spectrometry (MS) with collisional chemical dynamics simulations. These calculations were performed by explicitly considering the collisions between the protonated sugar and the neutral target gas, which led to an ensemble of trajectories for each system, from which it was possible to obtain reaction products and mechanisms without pre-imposing them. The β-aminoethyl and aminopropyl derivatives of cellobiose, maltose, and gentiobiose were studied to observe differences in both the stereochemistry and the location of the glycosidic linkage. Chemical dynamics simulations of MS/MS and MS/MS/MS were used to suggest some primary and secondary fragmentation mechanisms for some experimentally observed product ions. These simulations provided some new insights into the fundamentals of the unimolecular dissociation of protonated sugars under collisional induced dissociation conditions.

Thermodynamically controlled regioselective glycosylation of fully unprotected sugars through Bis(boronate) intermediates

Fully unprotected D-glucose, D-mannose, and D-fructose were regioselectively glycosylated with several phenylthioglycosides to afford glycosyl-β(1→6)-α/β-D-glucopyranose, glycosyl- β(1→1)-α-D-mannofuranoside, and glycosyl-β(1→1)- β-D-fructopyranose in goo

1,2-cis Alkyl glycosides: Straightforward glycosylation from unprotected 1-thioglycosyl donors

A 1,2-cis-alkyl glycosidation protocol that makes use of unprotected phenyl 1-thioglycosyl donors is reported. Glycosylation of various functionalized alcohols was accomplished in moderate to high yield and selectivity to give the 1,2-cis-glycosides. In order to quickly develop optimum glycosylation conditions, an FIA (flow injection analysis)-ESI-TOF-MS method was developed that enabled rapid and quantitative evaluation of yield on small scale. This methodology, coupled with NMR spectroscopy, allowed for rapid evaluation of the overall reactions.

Synthesis of leptosin, a glycoside isolated from mānuka honey

The first synthesis of leptosin, a novel glycoside isolated from mānuka honey is described. Utilising an acetyl protecting group strategy the glycoside was obtained with excellent anomeric selectivity by deploying a Schmidt glycosylation as a key step.

A route to oligosaccharide-appended salicylaldehydes: Useful building blocks for the synthesis of metal-salophen complexes

A simple and general synthetic protocol to obtain oligosaccharide-appended salicylaldehydes, key intermediates for the synthesis of water-soluble metal-salophen complexes, is here reported. Six new aldehydes have been prepared and fully characterized as well as the corresponding zinc- and uranyl-salophen complexes. These new derivatives show very good solubility in water. Preliminary studies on the association of compound 19-U, that is, the uranyl maltotetraose derivative, with hydrogen phosphate and fluoride provide very encouraging results and open up the possibility of using such compounds for the efficient recognition of anions in pure water.

Synthetic menthyl α/β-(1→6)-diglucopyranosides-induced cell death in human leukemia cells is dependent on caspases

A series of alkyl α/β-(1→6)-diglucopyranosides 1-12 were synthesized and assessed for cytotoxicity against HL-60, U937, Molt-3 and MCF-7 cancer cell lines. The menthyl derivatives displayed strong cytotoxic properties showing IC50 values betwee