McDonald IM, Black JW, Buck IM, Dunstone DJ, Griffin EP, Harper EA, Hull RAD, Kalindjian SB, Lilley EJ, Linney ID, Pether MJ, Roberts SP, Shaxted ME, Spencer J, Steel KIM, Sykes DA, Walker MK, Watt GF, Wright L, Wright PT, Xun W. Optimization of 1,3,4-benzotriazepine-based CCK(2) antagonists to obtain potent, orally active inhibitors of gastrin-mediated gastric acid secretion.
J Med Chem 2007;
50:3101-12. [PMID:
17536796 DOI:
10.1021/jm070139l]
[Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Starting from a novel, achiral 1,3,4-benzotriazepine-based CCK2 receptor antagonist, a process of optimization has afforded further compounds of this type that maintain the nanomolar affinity for recombinant, human CCK2 receptors and high selectivity over CCK1 receptors observed in the initial lead but display more potent inhibition of pentagastrin-stimulated gastric acid secretion in vivo. Moreover, this has largely been achieved without altering their potency at wild-type canine and rat receptors, as judged by their displacement of [125I]-BH-CCK-8S in a radioligand binding assay and by their activity in an isolated, perfused rat stomach bioassay, respectively. 2-(5-Cyclohexyl-1-(2-cyclopentyl-2-oxo-ethyl)-2-oxo-1,2-dihydro-3H-1,3,4-benzotriazepin-3-yl)-N-(3-(5-oxo-2,5-dihydro- [1,2,4]oxadiazol-3-yl)-phenyl)-acetamide (47) was identified as the most effective compound stemming from this approach, proving to be a potent inhibitor of pentagastrin-stimulated gastric acid secretion in rats and dogs by intravenous bolus as well as by enteral administration.
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