Thio-arylglycosides with various aglyconpara-substituents: a probe for studying chemical glycosylation reactions
作者:Xiaoning Li、Lijun Huang、Xiche Hu、Xuefei Huang
DOI:10.1039/b813048e
日期:——
indicates that the glycosylation mechanism remains the same over a wide range of reactivities and glycosylation conditions. The negative slopes of the Hammett plots suggested that electron donating substituents expedite the reactions and the magnitudes of slopes can be rationalized by neighboring group participation as well as electronic properties of the glycon protective groups. Within the same series
Aryl 1-thioglycosides have directly been synthesized in good yields from the corresponding unprotected sugars and thiols without protection of the hydroxy groups by using 2-chloro-1,3-dimethylimidazolinium chloride (DMC) as dehydrative condensing agent. The reaction proceeded in a mixed solvent of water and acetonitrile under mild reaction conditions, leading to the predominant formation of β-anomers.
Glucuronidase-catalyzed transglycosylation was examined by using 4-nitrophenyl β-D-glucuronide (D-GlcA-O-pNP) as the glycosyl donor; when pNP 6-O-sulfo-β-D-gluco- and D-galacto-pyranosides were used as the acceptors, a bovine enzyme was found to construct β-D-GlcA-(1â3)-linkages with the 6-O-sulfo-sugars in both a site- and β-selective way.
Disclosed are a drug having renal selectivity and a drug carrier for specifically transporting a drug supported thereon to a kidney. A segment structure specifically recognizable in the kidney is utilized. More specifically, since a segment structure represented by formula (I) is kidney-oriented, introduction of a drug into a molecule having the segment structure can provide a renal targeting drug. A compound, which has the segment structure and can support a drug thereon, can be utilized as a drug carrier which can specifically transport a drug supported thereon to the kidney.
A-U-V- (I)
wherein A represents glycosyl, such as glucosyl, mannosyl, or 2-deoxy-glucosyl; U represents O, S, or NH; and V represents an aromatic hydrocarbon or a straight-chain or branched C1-18 aliphatic hydrocarbon.
GLYCOSYLTRANSFERASE REVERSIBILITY FOR SUGAR NUCLEOTIDE SYNTHESIS AND MICROSCALE SCANNING
申请人:Thorson Jon S.
公开号:US20130004979A1
公开(公告)日:2013-01-03
The present invention generally relates to materials and methods for exploiting glycosyltransferase reversibility for nucleotide diphosphate (NDP) sugar synthesis. The present invention provides engineered glycosyltransferase enzymes characterized by improved reaction reversibility and expanded sugar donor specificity as compared to corresponding non-mutated glycosyltransferase enzymes. Such reagents provide advantageous routes to NDP sugars for subsequent use in a variety of biomedical applications, including enzymatic and chemo-enzymatic glycorandomization.