Abstract
New class of highly functionalized dispiropyrrolidine tethered indandione heterocycles in good yield were obtained through stereo- and regioselective single-pot three component cycloaddition methodology between benzylidene-indandione and non-stabilized azomethine ylide. The ylide generated from active diketone and aminophenylpropanoic acid via dehydration/decarboxylative pathway. The synthesized dispiropyrroldine comprising indandiones were elucidated through 1H and 13C NMR spectroscopic analysis, the stereo and regioselective formation of the dispiropyrrolidine were unequivocally assigned by X-ray diffraction analysis. Compound thus synthesized were assayed as potential inhibitor for the treatment of AD. Spiropyrrolidine 4h that bearing methoxy group on the phenyl ring showed significant activity, IC50 of 3.24 ± 0.25 and 10.25 ± 0.16 μM against acetyl and butyryl cholinesterase enzyme, respectively. The lead compound 4h executed to investigate for their docking simulation that showed strong binding affinity with binding site of the cholinesterase protein.
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