The synthesis of triazole-linked glycosyl acetophenone, benzoic acid, and α-ketocarboxylic acid derivatives was readily achieved via Cu(I)-catalyzed azide-alkyne cycloaddition ('click' reaction) in excellent yields of 93-97%. Among the synthesized glycoconjugates, the triazolyl α-ketocarboxylic acids were identified as the most potent protein tyrosine phosphatase 1B (PTP1B) inhibitors with micromole-ranged
Bidentate 1-O-methyl-alpha-D-pyranoglucosides bearing two triazolyl alpha-ketoester groups on the 2,6- or 3,4-positions of sugar scaffold were efficiently synthesized via Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition (click reaction) in good yields. These newly featured sugar derivatives displayed favorable inhibitory activity on protein tyrosine phosphatase 1B (PTP1B) and unexpected selective fluorescence quenching in the presence of Ni2+. (C) 2011 Elsevier Ltd. All rights reserved.