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

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.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Borthwick AD,Liddle J,Davies DE,Exall AM,Hamlett C,Hickey DM,Mason AM,Smith IE,Nerozzi F,Peace S,Pollard D,Sollis SL,Allen MJ,Woollard PM,Pullen MA,Westfall TD,Stanislaus DJ

doi

10.1021/jm201287w

subject

Has Abstract

pub_date

2012-01-26 00:00:00

pages

783-96

issue

2

eissn

0022-2623

issn

1520-4804

journal_volume

55

pub_type

杂志文章

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