During a structure–activity relationship optimization campaign to develop an inhibitor of AraC family transcriptional activators, we discovered an unexpected transformation of a previously reported inhibitor that occurs under the assay conditions. Once placed in the assay media, the 3,4-disubstituted dihydroquinoline core of the active analogue rapidly undergoes a decomposition reaction to a quaternary 3-substituted biquinolinium. Further examination established an SAR for this chemotype while also demonstrating its resilience to irreversible binding of biologically relevant nucleophiles.
在一次结构-活性关系优化活动中,旨在开发AraC家族转录激活因子的
抑制剂,我们发现了一个意外的转化,发生在之前报告的
抑制剂在检测条件下。一旦置于检测介质中,活性类似物的3,4-双取代二氢
喹啉核心迅速发生分解反应,生成四取代的3-取代双
喹啉离子。进一步的研究建立了该
化学类型的
SAR,同时也展示了其对
生物相关亲核体不可逆结合的抗性。