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Bioorg Med Chem Lett. 2007 Jul 1;17(13):3603-7. Epub 2007 Apr 24.

Evaluation of 4'-substituted bicyclic pyridones as non-steroidal inhibitors of steroid 5alpha-reductase.

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  • 1Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand. <>


4'-Substituted bicyclic pyridones were prepared and evaluated as non-steroidal inhibitors of type 1 and 2 steroid 5alpha-reductase (SR). A range of 4'-substituents were incorporated into the bicyclic scaffold to investigate SAR within and across different classes of non-steroidal inhibitors of SR. Bicyclic pyridones containing a 4'-benzoyl or long carbon chain tether showed more potent inhibition against type 1 SR than inhibitors with N-substituted acetamide groups in the 4'-position. SAR derived from 4'-substituted bicyclic pyridones reported here do not correlate with SAR derived from known potent 4'-substituted biaryl acid SR inhibitors. A 4'-benzoyl group is favoured by the active site in both isozymes.

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