Discovery of Aroyl Piperazine Derivatives as IKr & IKs Dual Inhibitors for Cardiac Arrhythmia Treatment
Xiaoke Guo, Haopeng Sun, Lvpei Du, Lu Huang, Jing Xu, Yingying Zhu, Peng Yu, Xiaojin Zhang, Yiqun Tang and Qidong You
Affiliation: China Pharmaceutical University, 24 Tongjia Road, Nanjing, China.
Combined blockade of IKr and IKs potassium channels is considered to be a promising therapeutic strategy for
arrhythmia. In this study, we designed and synthesized 15 derivatives through modifying the hit compound 7 that was discovered
by screening in-house database by whole-patch clamp technique. All of the compounds were evaluated on CHO
and HEK 293 cell lines stably expressing hERG (IKr) and hKCNQ1/KCNE1 (IKs) potassium channels, and half of them
exhibited improved dual IKr and IKs inhibitory effects compared to the hit compound. Compounds 7a and 7b with potent
dual inhibitory activities were selected for further in vivo evaluations. Due to the preferable pharmacological behaviors,
compound 7a deserved further optimization as a promising lead compound.
Keywords: IKr and IKs dual inhibitor, arrhythmia, class III antiarrhythmic agents.
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