Bedaquiline is a novel drug approved in 2012 by the FDA for treatment of drug-resistant tuberculosis (TB). Although it shows high efficacy towards drug-resistant forms of TB, its use has been limited by the potential for significant side effects. In particular, bedaquiline is a very lipophilic compound with an associated long terminal half-life and shows potent inhibition of the cardiac potassium hERG channel, resulting in QTc interval prolongation in humans that may result in cardiac arrhythmia. To address these issues, we carried out a drug discovery programme to develop an improved second generation analogue of bedaquiline. From this medicinal chemistry program, a candidate (TBAJ-876) has been selected to undergo further preclinical evaluation. During this evaluation, three major metabolites arising from TBAJ-876 were observed in several preclinical animal models. We report here our synthetic efforts to unequivocally structurally characterize these three metabolites through their independent directed synthesis.
贝达昆林是一种新型药物,2012年获得FDA批准用于治疗耐药结核病(TB)。尽管它对耐药结核病表现出高效性,但由于潜在的严重副作用,其使用受到限制。特别是,贝达昆林是一种非常亲脂性的化合物,具有长的终末半衰期,并且对心脏钾通道hERG表现出强效抑制作用,导致人体QTc间期延长,可能导致心律失常。为了解决这些问题,我们进行了一项药物发现计划,以开发改进的第二代贝达昆林类似物。从这个药物化学计划中,已选择了一个候选药物(TBAJ-876)进行进一步的临床前评估。在这个评估过程中,在几种临床前动物模型中观察到了TBAJ-876产生的三种主要代谢物。我们在这里报告了我们的合成努力,通过它们的独立定向合成来明确结构表征这三种代谢物。