A new type of galactose mimetics has been synthesized following a straightforward synthetic approach based on cyclohexene olefin aziridination reactions directed by hydroxyl substituents. These enantiomerically pure galacto-configured N-aminoaziridines are potent irreversible inhibitors of Aspergillus oryzae and Escherichia coliβ-galactosidases.
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http://dx.doi.org/10.1039/c5ob00532a | DOI Listing |
Molecules
October 2024
Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.
Glycoside hydrolases have been implicated in a wide range of human conditions including lysosomal storage diseases. Consequently, many researchers have directed their efforts towards identifying new classes of glycoside hydrolase inhibitors, both synthetic and from natural sources. A large percentage of such inhibitors are reversible competitive inhibitors that bind in the active site often due to them possessing structural features, often a protonatable basic nitrogen atom, that mimic the enzymatic transition state.
View Article and Find Full Text PDFChemistry
December 2024
Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
Cyclophellitol is a potent and selective mechanism-based retaining β-glucosidase inhibitor that has served as a versatile starting point for the development of activity-based glycosidase probes (ABPs). We developed routes of synthesis of eight mono- and dideoxycyclophellitols and cyclophellitol aziridines, the latter as ABPs carrying either a biotin or fluorophore linked to the aziridine nitrogen. We reveal the potency of these 24 compounds as inhibitors of the three human retaining β-glucosidases, GBA1, GBA2 and GBA3.
View Article and Find Full Text PDFChemistry
November 2024
Otto Diels Institute of Organic Chemistry, Christiana Albertina University of Kiel, Otto-Hahn-Platz 3-4, 24118, Kiel, Germany.
para-Nitrophenyl (PNP) ethers of glycosides are important building blocks en route to functional carbohydrates. They are stable in neutral media, however, under basic conditions such as during the Zemplén deacylation of sugars, aryl migration is frequently observed. We have employed a library of O-PNP-substituted methyl glycosides of the manno-, galacto-, gluco- and altro-series to study the kinetics of aryl migration in MeOH/sodium methoxide using NMR spectroscopy revealing that migration between cis-oriented OH groups is faster than between trans-oriented ones.
View Article and Find Full Text PDFOrg Lett
August 2024
Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology Jaipur 302017, India.
We herein reveal the possibility of the C-4 neighboring group/remote group participation (NGP/RGP) facilitating the stabilization of the anomeric center via dioxolenium intermediates in the chemoselective activation of glycal donors. We further realized that the configuration of the C-4 group in the galacto- and gluco-glycal series enables diverse pathways to give direct 1,2-addition or Ferrier rearrangement, respectively. A proof-of-principle for stereoselective glycosylation was amply illustrated by employing carbohydrates, amino acids, natural products, and bioactive molecules to develop 2-deoxy-glycan analogs.
View Article and Find Full Text PDFActa Crystallogr E Crystallogr Commun
August 2024
Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany.
The compounds 2',3',4',6'-tetra--acetyl-β-d-gluco-pyranosyl '-cyano--phenyl-carbamimido-thio-ate (CHNOS, ), 2',3',4',6'-tetra--acetyl-β-d-galacto-pyranosyl '-cyano-phenyl-carbamimido-thio-ate, (CHNOS, ), 2',3',4',6'-tetra--acetyl-β-d-galacto-pyranosyl '-cyano--methyl-carbamimido-thio-ate (CHNOS, ), and 2',3',4',6'-tetra--acetyl-β-d-galacto-pyranosyl '-cyano---tolyl-carbamimido-thio-ate (CHNOS, ) all crystallize in 222 with = 4. For all four structures, the configuration across the central (formal) C=N(CN) double bond of the carbamimido-thio-ate group is . The torsion angles C5-O1-C1-S (standard sugar numbering) are all close to 180°, confirming the β position of the substituent.
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