Synthesis of 3-Aminopyrazinone Mediated by 2-Pyridylthioimidate−ZnCl<sub>2</sub> Complexes. Development of an Efficient Route to a Thrombin Inhibitor
作者:John Y. L. Chung、Raymond J. Cvetovich、Fuh-Rong Tsay、Peter G. Dormer、Lisa DiMichele、David J. Mathre、Jennifer R. Chilenski、Bing Mao、Robert Wenslow
DOI:10.1021/jo034835e
日期:2003.11.1
analyses, and provided insight into the reaction mechanism. Preparation of pyridine N-oxide amine 4 was accomplished via a selective oxidation of the corresponding pyridinylamine 6. Pyridinylthioimidate 27 was prepared from pyrazinone 7 via a two-step one-pot process in near quantitative yield. Chlorination of the pyrazinone ring in 3 followed by hydrolysis and amide coupling completed the synthesis of
描述了由吡嗪酮7以47%的总收率六步制备凝血酶抑制剂候选药物1。弱胺亲核试剂4和不良亲电试剂3-溴吡嗪酮17之间的低反应性的问题已通过在ZnCl(2)存在下使用吡啶基硫代亚氨酸酯27来克服,以高收率提供加合物3。几种锌配合物通过溶液和固态NMR以及X射线晶体学分析进行了表征,并为反应机理提供了见识。吡啶N-氧化物胺4的制备是通过相应的吡啶基胺6的选择性氧化来完成的。吡啶基硫代亚氨酸酰亚胺27是由吡嗪酮7经两步一锅法以接近定量的产率制备的。吡嗪酮环在3中氯化,然后水解和酰胺偶联完成1的合成。