A structure–activity relationship study of potent TIQ15-derived CXCR4 antagonists is reported. In this investigation, the TIQ15 side-chain was constrained to improve its drug properties. The cyclohexylamino congener 15a was found to be a potent CXCR4 inhibitor (IC₅₀ = 33 nM in CXCL12-mediated Ca²⁺ flux) with enhanced stability in liver microsomes and reduced inhibition of CYP450 (2D6). The improved CXCR4 antagonist 15a has potential therapeutic application as a single agent or combinatory anticancer therapy.

中文翻译：

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具有刚性链的新型四氢异喹啉CXCR4拮抗剂的合成

报道了有效的TIQ15衍生的CXCR4拮抗剂的结构活性关系研究。在这项研究中，TIQ15侧链被限制以改善其药物特性。发现环己基氨基同源物15a是有效的CXCR4抑制剂（在CXCL12介导的Ca ²⁺通量中IC ₅₀ = 33 nM ），在肝微粒体中的稳定性增强，并且对CYP450（2D6）的抑制作用降低。改进的CXCR4拮抗剂15a具有作为单药或联合抗癌疗法的潜在治疗应用。