Improved synthesis of the thiophenol precursor N-(4-chloro-3-mercaptophenyl)picolinamide for making the mGluR4 PET ligands
作者:Junfeng Wang、Timothy M. Shoup、Anna-Liisa Brownell、Zhaoda Zhang
DOI:10.1016/j.tet.2019.06.010
日期:2019.7
However, the previously reported multi-step synthesis of the thiophenol precursor suffered from low yields and difficult workup procedures. To support the translational research of [11C]mG4P012 and the other potential applications, we have developed a new route for synthesis of the thiophenol precursor and optimized the reaction conditions. The synthesis of N-(4-chloro-3-mercaptophenyl)picolinamide
最近,[ 11 C] mG4P012(以前是[ 11 C] KALB012,现在被Prexton Therapeutics命名为[ 11 C] PXT012253)在潜在治疗药物PXT0002331(mGluR4 PAM)的临床前开发中被用作生物标志物。 PD和1-多巴引起的运动障碍。[ 11 C] mG4P012被证明是猴脑中mGluR4以及人类受试者进一步发展的有前途的PET放射性配体。然而,先前报道的硫酚前体的多步合成遭受产率低和后处理程序困难的困扰。支持[ 11C] mG4P012和其他潜在的应用,我们已经开发出了一种新的合成苯硫酚前体的途径,并优化了反应条件。由1-氯-4-硝基苯合成N-(4-氯-3-巯基苯基)吡啶甲酸酰胺的总收率从8%提高到52%,并且易于处理且克级。