Sixteen new 1‐(2‐methoxyphenyl)‐4‐(1‐phenethylpiperidin‐4‐yl)piperazines and 1‐(2‐methoxyphenyl)‐4‐[(1‐phenethylpiperidin‐4‐yl)methyl]piperazines were synthesized to be used as probes for mapping the dopamine D2 receptor (D2DAR) arylpiperazine binding site. All compounds were evaluated for their affinity toward D2DAR in an in vitro competitive displacement assay. The most active one was 1‐(2‐methoxyphenyl)‐4‐{[1‐(3‐nitrophenethyl)piperidin‐4‐yl]methyl}piperazine (25) with an affinity of Ki = 54 nM. Docking analysis was conducted on all herein described compounds, whereas molecular dynamic simulation was performed on ligand 25 to establish its mode of interaction with D2DAR. Two possible docking orientations are proposed; the one with a salt bridge between the piperidine moiety and Asp114 of D2DAR is more stable.

中文翻译：

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取代的 1-(2-甲氧基苯基)-4-(1-苯乙基哌啶-4-基)哌嗪和 1-(2-甲氧基苯基)-4-[(1-苯乙基哌啶-4-基) 的合成、生物学和计算评价甲基]哌嗪作为多巴胺能配体

合成了 16 种新的 1-(2-甲氧基苯基)-4-(1-苯乙基哌啶-4-基)哌嗪和 1-(2-甲氧基苯基)-4-[(1-苯乙基哌啶-4-基)甲基]哌嗪。用作绘制多巴胺 D2 受体 (D2DAR) 芳基哌嗪结合位点的探针。在体外竞争性置换试验中评估了所有化合物对 D2DAR 的亲和力。最活跃的是 1-(2-甲氧基苯基)-4-{[1-(3-硝基苯乙基)哌啶-4-基]甲基}哌嗪 (25)，其亲和力为 Ki = 54 nM。对本文所述的所有化合物进行对接分析，而对配体25进行分子动力学模拟以建立其与D2DAR的相互作用模式。提出了两种可能的对接方向；D2DAR 的哌啶部分和 Asp114 之间具有盐桥的更稳定。