Discovery of 3-Chloro-N-{(S)-[3-(1-ethyl-1H-pyrazol-4-yl)phenyl][(2S)-piperidine-2-yl]methyl}-4-(trifluoromethyl)pyridine-2-carboxamide as a Potent Glycine Transporter 1 Inhibitor
2016
A novel glycine transporter 1 (GlyT1) inhibitor was designed by the superposition of different chemotypes to enhance its inhibitory activity. Starting from 2-chloro-N-{(S)-phenyl[(2S)-piperidin-2-yl]methyl}-3-(trifluoromethyl)benzamide (2, SSR504734), the introduction of heteroaromatic rings enabled an increase in the GlyT1 inhibitory activity. Subsequent optimization led to the identification of 3-chloro-N-{(S)-[3-(1-ethyl-1H-pyrazol-4-yl)phenyl][(2S)-piperidine-2-yl]methyl}-4-(trifluoromethyl)pyridine-2-carboxamide (7w), which showed a powerful GlyT1 inhibitory activity (IC50=1.8 nM), good plasma exposure and a plasma to brain penetration in rats that was sufficient to evaluate the compound's pharmacological properties. Compound 7w showed significant effects in several rodent models for schizophrenia without causing any undesirable central nervous system side effects.
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