Synthesis, α-amylase inhibitory activity evaluation and in silico molecular docking study of some new phosphoramidates containing heterocyclic ring

We have synthesized a series of phosphoramidates containing a heterocyclic moiety with good yields (88-95%) by the reaction of (E)-5-benzylidene-3-((2-hydroxyethoxy)methyl)thiazolidine-2,4-dione with ethyl phosphorodichloridate followed by the reaction with various heterocyclic amines. The designed compounds were primarily screened for their ability to inhibit pancreatic alpha-amylase enzyme using in silico molecular docking approach. The compounds with good binding energies (-8.0 to -6.9 kcal/mol) when compared with standard drug, acarbose (-8.0 kcal/mol) were prompted for the synthesis. The structures of the newly prepared compounds were confirmed by their spectroscopic analyses. They were further screened in vitro for their inhibition toward alpha-amylase enzyme using acarbose as standard drug. All compounds exhibited moderate to good inhibition potential with IC50 values in the range of 54.14 +/- 0.35 to 185.04 +/- 0.53 mu g/mL when compared with the standard drug (IC50, 50.47 +/- 0.28 mu g/mL). Especially, the compound (E)-2-((5-benzylidene-2,4-dioxothiazolidin-3-yl)methoxy)ethyl ethyl 1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-ylphosphoramidate (6f) (IC50, 54.14 +/- 0.35 mu g/mL) and (E)-2-((5-benzylidene-2,4-dioxothiazolidin-3-yl)methoxy)ethyl ethyl benzo[d]thiazol-2-ylphosphoramidate (6c) (IC50, 57.02 +/- 0.32 mu g/mL) exhibited the best inhibition among the synthesized compounds.