β-Substituted Cyclohexanecarboxamide (cas 1122-56-1) cathepsin K inhibitors: Modification of the 1,2-disubstituted aromatic core

Add time:09/24/2019    Source:sciencedirect.com

Further SAR study around the central 1,2-disubstituted phenyl of the previously disclosed Cat K inhibitor (−)-1 has demonstrated that the solvent exposed P2–P3 linker can be replaced by various 5- or 6-membered heteroaromatic rings. While some potency loss was observed in the 6-membered heteroaromatic series (IC50 = 1 nM for pyridine-linked 4 vs 0.5 nM for phenyl-linked (±)-1), several inhibitors showed a significantly decreased shift in the bone resorption functional assay (10-fold for pyridine 4 vs 53-fold for (−)-1). Though this shift was not reduced in the 5-membered heteroaromatic series, potency against Cat K was significantly improved for thiazole 9 (IC50 = 0.2 nM) as was the pharmacokinetic profile of N-methyl pyrazole 10 over our lead compound (−)-1.

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