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Discovery of NR2B-selective antagonists via scaffold hopping and pharmacokinetic profile optimization
Kosuke Anan1, Moriyasu Masui1, Aya Tazawa1
1Medicinal Chemistry Research Laboratory, Shionogi & Co., Ltd, 1-1 Futabacho, 3-chome, Toyonaka 561-0825, Japan.
Abstract:
Selective N-methyl-d-aspartate receptor subunit 2B (NR2B) antagonists show potential as analgesic drugs, and do not cause side effects associated with non-selective N-methyl-d-aspartate (NMDA) antagonists. Using a scaffold-hopping approach, we previously identified isoxazole derivative 4 as a potent selective NR2B antagonist. In this study, further scaffold hopping of isoxazole derivative 4 and optimization of its pharmacokinetic profile led to the discovery of the orally bioavailable compound 6v. In a rat study of analgesia, 6v demonstrated analgesic effects against neuropathic pain.
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