Abstract
On the basis of a spirocyclic ether screening lead, a series of acyclic sulfones have been identified as high-affinity, selective 5-HT(2A) receptor antagonists. Bioavailability lacking in the parent, 1-(2-(2,4-difluorophenyl)ethyl)-4-(phenylsulfonyl)piperidine (12), was introduced by using stability toward rat liver microsomes as a predictor of bioavailability. By this means, the 4-cyano- and 4-carboxamidophenylsulfonyl derivatives 26 and 31 were identified as orally bioavailable, brain-penetrant analogues suitable for evaluation in animal models. Bioavailability was also attainable by N substitution leading to the N-phenacyl derivative 35. IKr activity detected through counterscreening was reduced to insignificant levels in vivo with the latter compound.
MeSH terms
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Administration, Oral
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Animals
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Benzamides / chemical synthesis*
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Benzamides / chemistry
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Benzamides / pharmacokinetics
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Benzamides / pharmacology
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Biological Availability
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Brain / metabolism
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Cation Transport Proteins*
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Cell Line
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Cricetinae
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DNA-Binding Proteins*
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Drug Evaluation, Preclinical
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ERG1 Potassium Channel
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Electrocardiography
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Ether-A-Go-Go Potassium Channels
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Ferrets
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Humans
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In Vitro Techniques
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Male
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Microsomes, Liver / metabolism
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Nitriles / chemical synthesis*
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Nitriles / chemistry
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Nitriles / pharmacokinetics
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Nitriles / pharmacology
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Piperidines / chemical synthesis*
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Piperidines / chemistry
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Piperidines / pharmacokinetics
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Piperidines / pharmacology
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Potassium Channels / metabolism
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Potassium Channels / physiology
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Potassium Channels, Voltage-Gated*
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Radioligand Assay
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Rats
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Rats, Sprague-Dawley
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Receptor, Serotonin, 5-HT2A
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Receptors, Serotonin / drug effects*
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Serotonin Antagonists / chemical synthesis*
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Serotonin Antagonists / chemistry
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Serotonin Antagonists / pharmacokinetics
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Serotonin Antagonists / pharmacology
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Serotonin Receptor Agonists / chemical synthesis
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Serotonin Receptor Agonists / chemistry
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Serotonin Receptor Agonists / pharmacokinetics
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Serotonin Receptor Agonists / pharmacology
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Spiro Compounds / chemical synthesis*
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Spiro Compounds / chemistry
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Spiro Compounds / pharmacokinetics
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Spiro Compounds / pharmacology
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Structure-Activity Relationship
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Sulfones / chemical synthesis*
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Sulfones / chemistry
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Sulfones / pharmacokinetics
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Sulfones / pharmacology
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Trans-Activators*
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Transcriptional Regulator ERG
Substances
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1-(4-fluorophenyl)-2-(4-(phenylsulfonyl)-1-piperidinyl)ethanone
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4-((1-(2-(2,4-difluorophenyl)ethyl)-4-piperidinyl)sulfonyl)benzamide
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4-((1-(2-(2,4-difluorophenyl)ethyl)-4-piperidinyl)sulfonyl)benzonitrile
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Benzamides
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Cation Transport Proteins
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DNA-Binding Proteins
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ERG protein, human
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ERG1 Potassium Channel
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Ether-A-Go-Go Potassium Channels
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KCNH6 protein, human
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Nitriles
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Piperidines
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Potassium Channels
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Potassium Channels, Voltage-Gated
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Receptor, Serotonin, 5-HT2A
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Receptors, Serotonin
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Serotonin Antagonists
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Serotonin Receptor Agonists
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Spiro Compounds
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Sulfones
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Trans-Activators
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Transcriptional Regulator ERG