14101-05-4

Upstream product

• 108-46-3 recorcinol 
• 572-09-8 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide 
• 50-99-7 D-glucose 
• 604-69-3 β-D-glucose pentaacetate 
• 69-79-4 D-maltose 
• 57-50-1 Sucrose 
• 114882-14-3 Acetic acid (2R,3R,4S,5R,6S)-3,5-diacetoxy-2-acetoxymethyl-6-(3-hydroxy-phenoxy)-tetrahydro-pyran-4-yl ester 
• 85708-07-2 1,3-Bis-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)benzene 

Relevant academic research and scientific papers

PHENOL GLYCOSIDES AND THEIR USE IN THE TREATMENT OF UROLITHIASIS

The present invention relates to novel derivatives of polyphenol glycoside or polyalcohols of formula (1), wherein R1, R2, R3 is selected from the group consisting of H, OH, C(O)R4, C(0) OR4, 0 (Gly H3)n, wherein n = 0 1, 2, 3, and R4 is selected from the group consisting of H, alkyl, and Gly is a mono- or disaccharide residue. The present invention also relates to novel derivatives of glycoside polyphenols or polyalcohols, as pharmaceutical composition comprising a novel polyphenol glycoside or polyalcohols and the use of novel polyphenol glycoside or polyalcohols for the treatment of urolithiasis.

Biphasic catalysis with disaccharide phosphorylases: Chemoenzymatic synthesis of α- D -glucosides using sucrose phosphorylase

Thanks to its broad acceptor specificity, sucrose phosphorylase (SP) has been exploited for the transfer of glucose to a wide variety of acceptor molecules. Unfortunately, the low affinity (Km > 1 M) of SP towards these acceptors typically urges the addition of cosolvents, which often either fail to dissolve sufficient substrate or progressively give rise to enzyme inhibition and denaturation. In this work, a buffer/ethyl acetate ratio of 5:3 was identified to be the optimal solvent system, allowing the use of SP in biphasic systems. Careful optimization of the reaction conditions enabled the synthesis of a range of α-d-glucosides, such as cinnamyl α-d-glucopyranoside, geranyl α-d-glucopyranoside, 2-O-α-d-glucopyranosyl pyrogallol, and series of alkyl gallyl 4-O-α-d-glucopyranosides. The usefulness of biphasic catalysis was further illustrated by comparing the glucosylation of pyrogallol in a cosolvent and biphasic reaction system. The acceptor yield for the former reached only 17.4%, whereas roughly 60% of the initial pyrogallol was converted when using biphasic catalysis.

Purification, characterization, and gene identification of an α-glucosyl transfer enzyme, a novel type α-glucosidase from Xanthomonas campestris WU-9701

The α-glucosyl transfer enzyme (XgtA), a novel type α-glucosidase produced by Xanthomonas campestris WU-9701, was purified from the cell-free extract and characterized. The molecular weight of XgtA is estimated to be 57 kDa by SDS-PAGE and 60 kDa by gel filtration, indicating that XgtA is a monomeric enzyme. Kinetic properties of XgtA were determined for α-glucosyl transfer and maltose-hydrolyzing activities using maltose as the α-glucosyl donor, and if necessary, hydroquinone as the acceptor. The Vmax value for α-glucosyl transfer activity was 1.3 × 10-2 (mM/s); this value was 3.9-fold as much as that for maltose-hydrolyzing activity. XgtA neither produced maltooligosaccharides nor hydrolyzed sucrose. The gene encoding XgtA that contained a 1614-bp open reading frame was cloned, identified, and highly expressed in Escherichia coli JM109 as the host. Site-directed mutagenesis identified Asp201, Glu270, and Asp331 as the catalytic sites of XgtA, indicating that XgtA belongs to the glycoside hydrolase family 13.

DIRECT CONDENSATION OF POLYHYDRIC PHENOLS WITH GLUCOSE

Acid-catalyzed direct condensation reaction of polyhydric phenols with free glucose in DMSO gave O-α-D-glucopyranoside in preference to its β-anomer; however, phloroglucinol and phloroacetophenone gave C-β-D-glucopyranoside instead.