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Design and synthesis of chiral 2H-chromene-N-imidazolo-amino acid conjugates as aldose reductase inhibitors.
European Journal of Medicinal Chemistry 2016 November 30
Aldose reductase (ALR2) inhibitors provide a viable mode to fight against diabetic complications. ALR2 exhibit plasticity in the active site vicinities and possible shifts in the nearby two supporting alpha helices. Therefore, a novel series of amino acid conjugates of chromene-3-imidazoles (13-15) were designed and synthesized based on natural isoflavonoids. The compounds were identified on the basis of spectral ((1)H NMR, (13)C NMR and MS) data and tested in vitro for ALR2 inhibitory activity with an IC50 value ranges from 0.031 ± 0.082 μM to 4.29 ± 0.55 μM. Our in silico and biochemical studies confirmed that 15e has the best inhibition activity among the synthesized compounds with a high selective index against the Aldehyde reductase (ALR1). Supplementation of 15e to STZ induced rats decreased the blood glucose levels and delayed the progression of cataract in a dose-dependent manner. The present study thus provides novel series of compounds with a promising inhibitor to prevent or delay the cataract progression.
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