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We report here the synthesis and biological evaluation of dideoxynojirimycin and its analogs and their functional effect on glucosidase enzyme inhibition against α-glucosidase(yeast), α-galactosidase and β-galactosidase (kluyveromyces lactis). All the compounds significantly inhibited the α-glucosidase(yeast) activity when compared to DNJ and shown strong inhibition against β-galactosidase (kluyveromyces lactis) when compared to DNJ. The molecular docking studies also reveals that these compounds showing strong ligand binding energies against yeast-ɑ-glucosidase- I, yeast β-galactosidase and human lysosomal acid–ɑ-glucosidase. Interestingly the analogues having N-H, N-alkyl and N-benzyl group along with ethyl group significantly inhibited the β-galactosidase activity when compared to DNJ. The in-silico studies are in correlation with invitro activity data; therefore, this study will be useful to develop further glycosidase inhibitors.