Dipeptide-derived compounds, bearing various P2 residues and a diaryl pyrrolidin-2-yl phosphonate at the P1 position, were evaluated as dipeptidyl peptidase 8 (DPP8) inhibitors. With these products, irreversible inhibition of DPP8 was observed. To obtain inhibitors with an improved activity and selectivity profile, a set of selected analogues containing a diaryl isoindolin-1-ylphosphonate at P1 was synthesized and evaluated. Within this latter series, compound 2e was shown to be a potent, irreversible inhibitor of DPP8, demonstrating very low affinity for DPP IV and DPP II.
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Veken et al. (2007) studied this question.
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