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Issue 46, 2013
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Synthesis of three 18F-labelled cyclooxygenase-2 (COX-2) inhibitors based on a pyrimidine scaffold

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Abstract

Cyclooxygenase (COX) is the key enzyme within the complex conversion of arachidonic acid into prostaglandins (PGs). Inhibitors of this enzyme represent a particularly promising class of compounds for chemoprevention and cancer therapy. The experimental data on the involvement of COX isoform COX-2 in tumour development and progression, as well as the observed overexpression of COX-2 in a variety of human cancers provide the rationale for targeting COX-2 for molecular imaging and therapy of cancer. A series of trifluoromethyl-substituted pyrimidines was prepared as a novel class of selective COX-2 inhibitors, based on the lead structure 1a. All compounds were tested in cyclooxygenase (COX) assays in vitro to determine COX-1 and COX-2 inhibitory potency and selectivity. Molecular docking studies using the catalytic site of COX-1 and COX-2, respectively, provided complementary theoretical support for the obtained experimental biological structure–activity relationship data of three highly potent and selective fluorobenzyl-containing COX-2 inhibitors. Selected fluorobenzyl-substituted pyrimidine derivatives were further developed as 18F-labelled radiotracers ([18F]1a, [18F]2a, [18F]3a). Radiotracers [18F]1a and [18F]2a were radiolabelled using 4-[18F]fluorobenzylamine ([18F]FBA) as a building block. Radiotracer [18F]3a was radiofluorinated directly using a nucleophilic aromatic substitution reaction with no-carrier-added (n.c.a.) [18F]fluoride on an iodylaryl compound as a labelling precursor.

Graphical abstract: Synthesis of three 18F-labelled cyclooxygenase-2 (COX-2) inhibitors based on a pyrimidine scaffold

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Publication details

The article was received on 23 Sep 2013, accepted on 26 Sep 2013 and first published on 02 Oct 2013


Article type: Paper
DOI: 10.1039/C3OB41935E
Citation: Org. Biomol. Chem., 2013,11, 8052-8064
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    Synthesis of three 18F-labelled cyclooxygenase-2 (COX-2) inhibitors based on a pyrimidine scaffold

    O. Tietz, S. K. Sharma, J. Kaur, J. Way, A. Marshall, M. Wuest and F. Wuest, Org. Biomol. Chem., 2013, 11, 8052
    DOI: 10.1039/C3OB41935E

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