A series of chemical optimizations guided by in vitro affinity at the α4β2 receptor in combination with selectivity against the α3β4 receptor, pharmacokinetic evaluation, and in vivo efficacy in a forced swim test resulted in identification of 3-(6-chloropyridine-3-yloxymethyl)-2-azabicyclo[3.1.0]hexane hydrochloride (9h, SUVN-911) as a clinical candidate. Compound 9h is a potent α4β2 receptor ligand with a Ki value of 1.5 nM. It showed >10 μM binding affinity toward the ganglionic α3β4 receptor apart from showing selectivity over 70 other targets. It is orally bioavailable and showed good brain penetration in rats. Marked antidepressant activity and dose-dependent receptor occupancy in rats support its potential therapeutic utility in the treatment of depression. It does not affect the locomotor activity at doses several folds higher than its efficacy dose. It is devoid of cardiovascular and gastrointestinal side effects. Successful long-term safety studies in animals and phase-1 evaluation in healthy humans for safety, tolerability, and pharmacokinetics paved the way for its further development.

中文翻译：

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3-（6-氯吡啶-3-基氧基甲基）-2-氮杂双环[3.1.0]己烷盐酸盐（SUVN-911）的发现和开发：一种新型，有效，选择性和口服活性的神经元烟碱乙酰胆碱α4β2受体拮抗剂治疗抑郁症。

在对α4β2受体的体外亲和力以及对α3β4受体的选择性，药代动力学评估以及在强制游泳试验中的体内功效的指导下，进行了一系列化学优化，从而鉴定出3-（6-氯吡啶-3-基氧基甲基）临床候选药物为-2-氮杂双环[3.1.0]己烷盐酸盐（9h，SUVN-911）。化合物9h是有效的α4β2受体配体，其Ki值为1.5nM。它显示出对神经节α3β4受体的结合亲和力> 10μM，除了对其他70个靶标表现出选择性。它具有口服生物利用度，并在大鼠中表现出良好的大脑渗透能力。大鼠中明显的抗抑郁活性和剂量依赖性受体占有率支持其在抑郁症治疗中的潜在治疗作用。它不影响运动活性，其剂量比其有效剂量高出几倍。它没有心血管和胃肠道副作用。成功的动物长期安全性研究以及健康人在安全性，耐受性和药代动力学方面的1期评估为进一步的发展铺平了道路。