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Publication Abstract from PubMed

A novel series of pyridazinone-based phosphodiesterase 10A (PDE10A) inhibitors were synthesized. Our optimization efforts using structure-based drug design (SBDD) techniques on the basis of the X-ray crystal structure of PDE10A in complex with hit compound 1 (IC50 = 23 nM; 110-fold selectivity over other PDEs) led to the identification of 1-[2-fluoro-4-(1H-pyrazol-1-yl)phenyl]-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyri dazin-4(1H)-one (27h). Compound 27h has potent inhibitory activity (IC50 = 0.30 nM), excellent selectivity (>15000-fold selectivity over other PDEs), and favorable pharmacokinetics, including high brain penetration, in mice. Oral administration of compound 27h to mice elevated striatal 3',5'-cyclic adenosine monophosphate (cAMP) and 3',5'-cyclic guanosine monophosphate (cGMP) levels at 0.3 mg/kg and showed potent suppression of phencyclidine (PCP)-induced hyperlocomotion at a minimum effective dose (MED) of 0.3 mg/kg. Compound 27h (TAK-063) is currently being evaluated in clinical trials for the treatment of schizophrenia.

Discovery of 1-[2-fluoro-4-(1H-pyrazol-1-yl)phenyl]-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyri dazin-4(1H)-one (TAK-063), a highly potent, selective, and orally active phosphodiesterase 10A (PDE10A) inhibitor.,Kunitomo J, Yoshikawa M, Fushimi M, Kawada A, Quinn JF, Oki H, Kokubo H, Kondo M, Nakashima K, Kamiguchi N, Suzuki K, Kimura H, Taniguchi T J Med Chem. 2014 Nov 26;57(22):9627-43. doi: 10.1021/jm5013648. Epub 2014 Nov 10. PMID:25384088^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.