Identification of (R)-6-(1-(4-Cyano-3-methylphenyl)-5-cyclopentyl-4,5-dihydro-1H-pyrazol-3-yl)-2-methoxynicotinic Acid, a Highly Potent and Selective Nonsteroidal Mineralocorticoid Receptor AntagonistClick to copy article linkArticle link copied!
- Agustin Casimiro-Garcia
- David W. Piotrowski
- Catherine Ambler
- Graciela B. Arhancet
- Mary Ellen Banker
- Tereece Banks
- Carine M. Boustany-Kari
- Cuiman Cai
- Xiangyang Chen
- Rena Eudy
- David Hepworth
- Catherine A. Hulford
- Sandra M. Jennings
- Paula M. Loria
- Marvin J. Meyers
- Donna N. Petersen
- Neil K. Raheja
- Matthew Sammons
- Li She
- Kun Song
- Derek Vrieze
- Liuqing Wei
Abstract

A novel series of nonsteroidal mineralocorticoid receptor (MR) antagonists identified as part of our strategy to follow up on the clinical candidate PF-03882845 (2) is reported. Optimization departed from the previously described pyrazoline 3a and focused on improving the selectivity for MR versus the progesterone receptor (PR) as an approach to avoid potential sex-hormone-related adverse effects and improving biopharmaceutical properties. From this effort, (R)-14c was identified as a potent nonsteroidal MR antagonist (IC50 = 4.5 nM) with higher than 500-fold selectivity versus PR and other related nuclear hormone receptors, with improved solubility as compared to 2 and pharmacokinetic properties suitable for oral administration. (R)-14c was evaluated in vivo using the increase of urinary Na+/K+ ratio in rat as a mechanism biomarker of MR antagonism. Treatment with (R)-14c by oral administration resulted in significant increases in urinary Na+/K+ ratio and demonstrated this novel compound acts as an MR antagonist.
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