Heterocyclic analogues of N-(4-(4-(2,3-dichlorophenyl)piperazin-1-yl)butyl) arylcarboxamides with functionalized linking chains as novel dopamine D3 receptor ligands: Potential substance abuse therapeutic agents

Peter Grundt, Katherine M. Prevatt, Jianjing Cao, Michelle Taylor, Christina Z. Floresca, Ji Kyung Choi, Bruce G. Jenkins, Robert R. Luedtke, Amy Hauck Newman

Research output: Contribution to journalArticle

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Abstract

Dopamine D3 receptor antagonists and partial agonists have been shown to modulate drug-seeking effects induced by cocaine and other abused substances. Compound 6 [PG01037, (N-(4-(4-(2,3-dichlorophenyl)-piperazin-1-yl)-trans-but-2- enyl)-4-pyridine-2-ylbenzamide)] and related analogues are currently being evaluated in animal models of drug addiction. In these studies, a discrepancy between in vitro binding affinity, in vivo occupancy, and behavioral potency has been observed. The purpose of this study was to examine (1) modifications of the 2-pyridylphenyl moiety of 6 and (2) hydroxyl, acetyl, and cyclopropyl substitutions on the butylamide linking chain systematically coupled with 2-fluorenylamide or 2-pyridylphenylamide and 2-methoxy- or 2,3-dichloro- substituted phenylpiperazines to measure the impact on binding affinity, D2/D3 selectivity, lipophilicity, and function. In general, these modifications were well tolerated at the human dopamine D3 (hD3) receptor (Ki = 1-5 nM) as measured in competition binding assays. Several analogues showed > 100-fold selectivity for dopamine D3 over D2 and D4 receptors. In addition; while all the derivatives with an olefinic linker were antagonists, in quinpirole-stimulated mitogenesis at hD3 receptors, several of the hydroxybutyl-linked analogues (16, 17, 21) showed partial agonist activity. Finally, several structural modifications reduced lipophilicities while retaining the desired binding profile.

Original languageEnglish
Pages (from-to)4135-4146
Number of pages12
JournalJournal of Medicinal Chemistry
Volume50
Issue number17
DOIs
StatePublished - 23 Aug 2007

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