An Efficient Scale-Up Synthesis of BMS-520, a Potent and Selective Isoxazole-Containing S1P<sub>1</sub> Receptor Agonist
作者:Xiaoping Hou、Juliang Zhu、Bang-Chi Chen、Scott H. Watterson、William J. Pitts、Alaric J. Dyckman、Percy H. Carter、Arvind Mathur、Huiping Zhang
DOI:10.1021/acs.oprd.6b00112
日期:2016.5.20
This article reports an efficient scale-up synthesis of 1-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)benzyl)azetidine-3-carboxylic acid (BMS-520), a potent and selective isoxazole-containing S1P1 receptor agonist. This process features a highly regioselective cycloaddition leading to a key intermediate, ethyl 3-phenyl-4-(trifluoromethyl)isoxazole-5-carboxylate, a chemo-selective
本文报告了1-(4-(5-(3-苯基-4-(三氟甲基)异恶唑-5-基)-1,2,4-恶二唑-3-基)苄基)氮杂环丁烷的高效放大合成-3-羧酸(BMS-520),一种有效且选择性的含异恶唑的S1P 1受体激动剂。该方法的特点是具有高度区域选择性的环加成反应,生成关键中间体3-苯基-4-(三氟甲基)异恶唑-5-羧酸乙酯,其区域异构体的化学选择性水解以及改进的1,2,4方法-恶二唑的形成,相对于原始合成。改进后的工艺被用于制备多批次的BMS-520,用于临床前毒理学研究。