2. Academic Validation
  3. Pyridyl-2,5-diketopiperazines as potent, selective, and orally bioavailable oxytocin antagonists: synthesis, pharmacokinetics, and in vivo potency

Pyridyl-2,5-diketopiperazines as potent, selective, and orally bioavailable oxytocin antagonists: synthesis, pharmacokinetics, and in vivo potency

  • J Med Chem. 2012 Jan 26;55(2):783-96. doi: 10.1021/jm201287w.
Alan D Borthwick 1,  John Liddle,  Dave E Davies,  Anne M Exall,  Christopher Hamlett,  Deirdre M Hickey,  Andrew M Mason,  Ian E D Smith,  Fabrizio Nerozzi,  Simon Peace,  Derek Pollard,  Steve L Sollis,  Michael J Allen,  Patrick M Woollard,  Mark A Pullen,  Timothy D Westfall,  Dinesh J Stanislaus
Affiliations

Affiliation

  • 1 Department of Medicinal Chemistry, GlaxoSmithKline Research and Development, Medicines Research Centre, Gunnels Wood Road, Stevenage, Herts SG1 2NY, UK. alan.d.borthwick@drugmoldesign.com
PMID: 22239250 DOI: 10.1021/jm201287w
Abstract

A six-stage stereoselective synthesis of indanyl-7-(3'-pyridyl)-(3R,6R,7R)-2,5-diketopiperazines oxytocin antagonists from indene is described. SAR studies involving mono- and disubstitution in the 3'-pyridyl ring and variation of the 3-isobutyl group gave potent compounds (pK(i) > 9.0) with good aqueous solubility. Evaluation of the pharmacokinetic profile in the rat, dog, and cynomolgus monkey of those derivatives with low cynomolgus monkey and human intrinsic clearance gave 2',6'-dimethyl-3'-pyridyl R-sec-butyl morpholine amide Epelsiban (69), a highly potent oxytocin antagonist (pK(i) = 9.9) with >31000-fold selectivity over all three human vasopressin receptors hV1aR, hV2R, and hV1bR, with no significant P450 inhibition. Epelsiban has low levels of intrinsic clearance against the microsomes of four species, good bioavailability (55%) and comparable potency to atosiban in the rat, but is 100-fold more potent than the latter in vitro and was negative in the genotoxicity screens with a satisfactory oral safety profile in female rats.

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