Lerisetron Analogues with Antimalarial Properties: Synthesis, Structure–Activity Relationship Studies, and Biological Assessment

作者：Rudolf Mueller, Virsinha Reddy, Aloysius T. Nchinda, Fanuel M. Mebrahtu, Dale Taylor, Nina Lawrence, Lloyd Tanner, Marine A. Barnabé, Charles J. Eyermann, Bin Zou, Ravinder Reddy Kondreddi, Suresh B. Lakshminarayana, Matthias Rottmann, Leslie J. Street, Kelly Chibale · 发表于：ACS Omega · 年份：2020 · DOI：10.1021/acsomega.0c00327 · 被引用次数：19 · 研究领域：Malaria Research and Control、Phenothiazines and Benzothiazines Synthesis and Activities、Drug-Induced Hepatotoxicity and Protection

High Resolution Image Download MS PowerPoint Slide A phenotypic whole cell high-throughput screen against the asexual blood and liver stages of the malaria parasite identified a benzimidazole chemical series. Among the hits were the antiemetic benzimidazole drug Lerisetron 1 (IC 50 NF54 = 0.81 μM) and its methyl-substituted analogue 2 (IC 50 NF54 = 0.098 μM). A medicinal chemistry hit to lead effort led to the identification of chloro-substituted analogue 3 with high potency against the drug-sensitive NF54 (IC 50 NF54 = 0.062 μM) and multidrug-resistant K1 (IC 50 K1 = 0.054 μM) strains of the human malaria parasite Plasmodium falciparum . Compounds 2 and 3 gratifyingly showed in vivo efficacy in both Plasmodium berghei and P. falciparum mouse models of malaria. Cardiotoxicity risk as expressed in strong inhibition of the human ether-a-go-go-related gene (hERG) potassium channel was identified as a major liability to address. This led to the synthesis and biological assessment of around 60 analogues from which several compounds with improved antiplasmodial potency, relative to the lead compound 3, were identified.