The endochin-like quinolone (ELQ) compound class may yield effective, safe treatments for a range of important human and animal afflictions. However, to access the public health potential of this compound series, a synthetic route needed to be devised, which would lower costs and be amenable to large-scale production. In the new synthetic route described here, a substituted β-keto ester, formed by an Ullmann reaction and subsequent acylation, is reacted with an aniline via a Conrad–Limpach reaction to produce 3-substituted 4(1H)-quinolones such as ELQ-300 and ELQ-316. This synthetic route, the first described to be truly amenable to industrial-scale production, is relatively short (five reaction steps), does not require palladium, chromatographic separation, or protecting group chemistry, and may be performed without high vacuum distillation.

中文翻译：

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ELQ-300、ELQ-316 和其他抗寄生虫喹诺酮类药物的新可扩展合成路线

内啡肽样喹诺酮 (ELQ) 化合物类可以为一系列重要的人类和动物疾病提供有效、安全的治疗方法。然而，为了获得该化合物系列的公共卫生潜力，需要设计一种合成路线，该路线将降低成本并适合大规模生产。在这里描述的新合成路线中，通过 Ullmann 反应和随后的酰化形成取代的 β-酮酯，通过 Conrad-Limpach 反应与苯胺反应生成 3-取代的 4( 1H )-喹诺酮类，例如ELQ -300和ELQ-316. 该合成路线首次被描述为真正适合工业规模生产，相对较短（五个反应步骤），不需要钯、色谱分离或保护基化学，并且可以在没有高真空蒸馏的情况下进行。