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Lead Optimization of 5-Aryl Benzimidazolone- And Oxindole-Based AMPA Receptor Modulators Selective for TARP γ-8

Lead Optimization of 5-Aryl Benzimidazolone- And Oxindole-Based AMPA Receptor Modulators Selective for TARP γ-8

Suchitra Ravula, Brad M Savall, Nyantsz Wu, Brian Lord, Kevin Coe, Kai Wang, Mark Seierstad, Devin M Swanson, Jeannie Ziff, Minh Nguyen, Perry Leung, Ray Rynberg, David La, Daniel J Pippel, Tatiana Koudriakova, etc.

ACS Med Chem Lett. 2018 Jul 13;9(8):821-826.

PMID: 30128074

Abstract:

Glutamate mediates fast excitatory neurotransmission via ionotropic α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. The trafficking and gating properties of AMPA receptors (AMPARs) can be amplified by transmembrane AMPAR regulatory proteins (TARPs), which are often expressed in localized brain regions. Herein, we describe the discovery, lead optimization, and preclinical characterization of 5-arylbenzimidazolone and oxindole-based negative modulators of AMPARs associated with TARP γ-8, the primary TARP found in hippocampus. High-throughput screen lead 4 was optimized for potency and brain penetration to provide benzimidazolone 3, JNJ-55511118.1 Replacement of the benzimidazolone core in 3 with an oxindole mitigated reactive metabolite formation and led to the identification of 18 (GluA1/γ-8 pIC50 = 9.7). Following oral dosing in rats, 18 demonstrated robust target engagement in hippocampus as assessed by ex vivo autoradiography (ED50 = 0.6 mg/kg, plasma EC50 = 9 ng/mL).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR4243735	JNJ-55511118			Price

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