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Synthesis, structural evaluation, and estrogen receptor interaction of 2,3-diarylpiperazines
Ronald Gust1, Roland Keilitz, Kathrin Schmidt
1Institute of Pharmacy, Free University of Berlin, Königin-Luise Strasse 2+4, D-14195 Berlin, Germany. rgust@zedat.fu-berlin.de
Journal of Medicinal Chemistry
|May 17, 2002
Summary
Novel piperazine derivatives were synthesized to target the estrogen receptor (ER). Some compounds showed significant ER-mediated gene activation, highlighting the importance of specific structural features for ligand activity.
Area of Science:
- Medicinal Chemistry
- Molecular Pharmacology
- Organic Synthesis
Background:
- Estrogen receptor (ER) ligands are crucial for understanding and treating hormone-dependent diseases.
- Developing novel ER ligands with specific activity profiles remains a key research area.
- Previous work identified a hormonally active ethylenediamine derivative as a starting point.
Purpose of the Study:
- To synthesize novel ring-fused piperazine derivatives as potential estrogen receptor (ER) ligands.
- To investigate the structure-activity relationships (SAR) of these compounds concerning ER binding and gene activation.
- To explore the impact of aromatic ring substitution and N-alkylation on ER ligand properties.
Main Methods:
- Synthesis of piperazine derivatives from methoxy-substituted 1,2-diarylethylenediamines.
- Utilized dimethyl oxalate, BH3*tetrahydrofuran, and BBr3 for cyclization, reduction, and ether cleavage.
- N-alkylation of piperazines followed by reduction and ether cleavage to generate further derivatives.
- Evaluated ligand-dependent gene expression in MCF-7-2a cells transfected with ERE(wtc)luc.
- Determined relative binding affinity to the estrogen receptor (ER).
Main Results:
- Piperazine derivative 4 demonstrated ligand-dependent gene expression, serving as a lead structure.
- Specific substitution patterns and N-ethyl chains influenced ER binding and gene activation.
- Compounds 8 and 11 showed relative binding affinity > 0.1%, with compound 8 at 0.42%.
- Significant ER-mediated gene activation (at 1 microM) was observed for piperazines 4 (20%), 6 (73%), 7 (34%), 8 (74%), and 11 (37%).
- O-methylation resulted in inactive compounds, indicating the necessity of hydrogen bonds for ER activation.
Conclusions:
- Novel piperazine derivatives were successfully synthesized and evaluated as potential ER ligands.
- The study elucidated the SAR of these compounds, identifying key structural features for ER interaction.
- Specific N-ethylated piperazines exhibit promising ER-mediated gene activation, warranting further investigation.