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New N-n-propyl-substituted 3-aryl- and 3-cyclohexylpiperidines as partial agonists at the D4 dopamine receptor.

Abstract：

:We have previously reported that compounds dimethyl-substituted on the phenyl ring of N-n-propyl-3-phenylpiperidines (PPEs) have a high (nM) affinity and selectivity toward the D(4) dopamine receptor (D(4) DAR) with m,p-dimethyl PPE (1) having the highest affinity and selectivity. In the present paper we have investigated the role of the methyl substitution by the synthesis of monomethylated (2a-c) and nonmethylated (2d) PPEs followed by the characterization of their biological properties using receptor binding assays. Our findings reveal that the methyl substitution of the phenyl ring is not necessary for a high and selective binding affinity to the D(4) DAR. Moreover, we have also synthesized cyclohexylpiperidines (CHPEs, 3a-d), which all showed higher binding affinities for the D(4) DAR than their aromatic counterparts. These results indicate that a pi-pi type interaction of the phenyl ring of PPEs with the D(4) DAR might not be essential, whereas a simple hydrophobic attraction between the cyclohexyl substituent of CHPEs and a hypothesized lipophilic pocket of the receptor might be crucial. Furthermore, functional assays indicate that 3d, as well as 1, are partial agonist at the D(4) DAR and therefore might represent new pharmacological tools to investigate the role of D(4) DAR activation in the control of cognitive functions and emotional states in health and disease.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Macchia M,Cervetto L,Demontis GC,Longoni B,Minutolo F,Orlandini E,Ortore G,Papi C,Sbrana A,Macchia B

doi

10.1021/jm021019a

keywords:

subject

Has Abstract

pub_date

2003-01-02 00:00:00

pages

161-8

issue

1

eissn

0022-2623

issn

1520-4804

journal_volume

46

pub_type

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