当前位置： SCI文献检索 > JOURNAL OF MEDICINAL CHEMISTRY期刊下所有文献 > Synthesis, ex vivo evaluation, and radiolabeling of potent 1,5-diphenylpyrrolidin-2-one cannabinoid subtype-1 receptor ligands as candidates for in vivo imaging.

Synthesis, ex vivo evaluation, and radiolabeling of potent 1,5-diphenylpyrrolidin-2-one cannabinoid subtype-1 receptor ligands as candidates for in vivo imaging.

Abstract：

:We have reported that [methyl- (11)C] (3 R,5 R)-5-(3-methoxyphenyl)-3-[(R)-1-phenylethylamino]-1-(4-trifluoromethylphenyl)pyrrolidin-2-one ([(11)C] 8, [(11)C]MePPEP) binds with high selectivity to cannabinoid type-1 (CB 1) receptors in monkey brain in vivo. We now describe the synthesis of 8 and four analogues, namely, the 4-fluorophenyl (16, FMePPEP), 3-fluoromethoxy (20, FMPEP), 3-fluoromethoxy- d 2 (21, FMPEP- d 2), and 3-fluoroethoxy analogues (22, FEPEP), and report their activity in an ex vivo model designed to identify compounds suitable for use as positron emission tomography (PET) ligands. These ligands exhibited high, selective potency at CB 1 receptors in vitro (K b < 1 nM). Each ligand (30 microg/kg, iv) was injected into rats under baseline and pretreatment conditions (3, rimonabant, 10 mg/kg, iv) and quantified at later times in frontal cortex ex vivo with liquid chromatography-mass spectrometry (LC-MS) detection. Maximal ligand uptakes were high (22.6-48.0 ng/g). Under pretreatment, maximal brain uptakes were greatly reduced (6.5-17.3 ng/g). Since each ligand readily entered brain and bound with high selectivity to CB 1 receptors, we then established and here describe methods for producing [(11)C] 8, [(11)C] 16, and [(18)F] 20- 22 in adequate activities for evaluation as candidate PET radioligands in vivo.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Donohue SR,Krushinski JH,Pike VW,Chernet E,Phebus L,Chesterfield AK,Felder CC,Halldin C,Schaus JM

doi

10.1021/jm800416m

subject

Has Abstract

pub_date

2008-09-25 00:00:00

pages

5833-42

issue

18

eissn

0022-2623

issn

1520-4804

journal_volume

51

pub_type

杂志文章

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