Design and synthesis of a novel 2-oxindole scaffold as a highly potent and brain-penetrant phosphodiesterase 10A inhibitor
作者:Masato Yoshikawa、Haruhi Kamisaki、Jun Kunitomo、Hideyuki Oki、Hironori Kokubo、Akihiro Suzuki、Tomomi Ikemoto、Kosuke Nakashima、Naomi Kamiguchi、Akina Harada、Haruhide Kimura、Takahiko Taniguchi
DOI:10.1016/j.bmc.2015.10.002
日期:2015.11
Highly potent and brain-penetrant phosphodiesterase 10A (PDE10A) inhibitors based on the 2-oxindole scaffold were designed and synthesized. (2-Oxo-1,3-oxazolidin-3-yl) phenyl derivative 1 showed the high P-glycoprotein (P-gp) efflux (efflux ratio (ER) = 6.2) despite the potent PDE10A inhibitory activity (IC50 = 0.94 nM). We performed an optimization study to improve both the P-gp efflux ratio and PDE10A inhibitory activity by utilizing structure-based drug design (SBDD) techniques based on the X-ray crystal structure with PDE10A. Finally, 1-(cyclopropylmethyl)-4-fluoro-5-[5-methoxy-4-oxo-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-1(4H)-yl]-3,3-dimethyl-1,3-dihydro-2H-indol-2-one (19e) was identified with improved P-gp efflux (ER = 1.4) and an excellent PDE10A inhibitory activity (IC50 = 0.080 nM). Compound 19e also exhibited satisfactory brain penetration, and suppressed PCP-induced hyperlocomotion with a minimum effective dose of 0.3 mg/kg by oral administration in mice. (C) 2015 Elsevier Ltd. All rights reserved.