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  • Title: Prodrugs of perzinfotel with improved oral bioavailability.
    Author: Baudy RB, Butera JA, Abou-Gharbia MA, Chen H, Harrison B, Jain U, Magolda R, Sze JY, Brandt MR, Cummons TA, Kowal D, Pangalos MN, Zupan B, Hoffmann M, May M, Mugford C, Kennedy J, Childers WE.
    Journal: J Med Chem; 2009 Feb 12; 52(3):771-8. PubMed ID: 19146418.
    Abstract:
    Previous studies with perzinfotel (1), a potent, selective, competitive NMDA receptor antagonist, showed it to be efficacious in inflammatory and neuropathic pain models. To increase the low oral bioavailability of 1 (3-5%), prodrug derivatives (3a-h) were synthesized and evaluated. The oxymethylene-spaced diphenyl analogue 3a demonstrated good stability at acidic and neutral pH, as well as in simulated gastric fluid. In rat plasma, 3a was rapidly converted to 1 via 2a. Pharmacokinetic studies indicated that the amount of systemic exposure of 1 produced by a 10 mg/kg oral dose of 3a was 2.5-fold greater than that produced by a 30 mg/kg oral dose of 1. Consistent with these results, 3a was significantly more potent and had a longer duration of activity than 1 following oral administration in a rodent model of inflammatory pain. Taken together, these results demonstrate that an oxymethylene-spaced prodrug approach increased the bioavailability of 1.
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