1H-[1,2,3]-Triazol-1-yl mannosides have been synthesized as inhibitors for the beta-galactoside-binding family of galectin proteins. Easier synthetic access to C1 in mannose, as compared to C3 in galactose, for attachment of affinity-enhancing triazoles rendered a synthetic advantage. The best mannose-derived inhibitor for galectin-9N, 4-benzylaminocarbonyl-1H-[1,2,3]-triazol-1-yl beta-D-mannopyranoside, had a Kd value of 540 microM, which compares favorably with its galactoside counterpart (Kd=670 microM) and with LacNAc (Kd=500 microM).
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