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Improvement of hERG-ROMK index of spirocyclic ROMK inhibitors through scaffold optimization and incorporation of novel pharmacophores.
Bioorganic & Medicinal Chemistry Letters 2017 June 2
SAR in the previously described spirocyclic ROMK inhibitor series was further evolved from lead 4 by modification of the spirocyclic core and identification of novel right-side pharmacophores. In this process, it was discovered that the spiropyrrolidinone core with the carbonyl group α to the spirocenter was preferred for potent ROMK activity. Efforts aimed at decreasing hERG affinity within the series led to the discovery of multiple novel right-hand pharmacophores including 3-methoxythiadiazole, 2-methoxypyrimidine, and pyridazinone. The most promising candidate is pyridazinone analog 32 that showed an improved functional hERG/ROMK potency ratio and preclinical PK profile. In vivo evaluation of 32 demonstrated blood pressure lowering effects in the spontaneously hypertensive rat model.
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