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  • Title: Identification of biaryl sulfone derivatives as antagonists of the histamine H₃ receptor: discovery of (R)-1-(2-(4'-(3-methoxypropylsulfonyl)biphenyl-4-yl)ethyl)-2-methylpyrrolidine (APD916).
    Author: Semple G, Santora VJ, Smith JM, Covel JA, Hayashi R, Gallardo C, Ibarra JB, Schultz JA, Park DM, Estrada SA, Hofilena BJ, Smith BM, Ren A, Suarez M, Frazer J, Edwards JE, Hart R, Hauser EK, Lorea J, Grottick AJ.
    Journal: Bioorg Med Chem Lett; 2012 Jan 01; 22(1):71-5. PubMed ID: 22172695.
    Abstract:
    The design of a new clinical candidate histamine-H(3) receptor antagonist for the potential treatment of excessive daytime sleepiness (EDS) is described. Phenethyl-R-2-methylpyrrolidine containing biphenylsulfonamide compounds were modified by replacement of the sulfonamide linkage with a sulfone. One compound from this series, 2j (APD916) increased wakefulness in rodents as measured by polysomnography with a duration of effect consistent with its pharmacokinetic properties. The identification of a suitable salt form of 2j allowed it to be selected for further development.
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