Add time:09/05/2019         Source:sciencedirect.com

The fluorinated piperidine iminosugars 2a-4a and their N-octyl and N-decyl derivatives 2b,c-4b,c were synthesized from d-mannose/d-xylose using nucleophilic fluorination as the key step. The conformation of iminosugars 2/3, either 2C5 or 5C2, was assigned based on the 1H NMR studies at different pH. Immunomodulatory activity of 2a,c-4a,c was examined using Mixed Lymphocyte Reaction (MLR) and B-cell assay. The N-alkylated fluorinated d-manno-iminosugars 3b/4b were found to be better immunosuppressive agents (IC50 = 5–6 μM) on T-cells. The fluorinated iminosugar 3a/4a act as potent and selective inhibitors of β-glucosidase (IC50 = 4–8 μM). The N-alkyl-iminosugars 4b-c were found to be moderate inhibitors of α-glucosidase (yeast) and α-galactosidase (coffee beans), respectively.

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