Development of a Scaleable Synthesis of a 3-Aminopyrazinone Acetamide Thrombin Inhibitor
作者:Michael S. Ashwood、Ramon J. Alabaster、Ian F. Cottrell、Cameron J. Cowden、Antony J. Davies、Ulf H. Dolling、Khateeta M. Emerson、Andrew D. Gibb、David Hands、Debra J. Wallace、Robert D. Wilson
DOI:10.1021/op0341420
日期:2004.3.1
addressed to provide a safe, efficient, and robust route for the preparation of multi-kilo amounts of the compound. The use of expensive and toxic reagents, notably sodium azide, TMS-cyanide, and Deoxo-Fluor, and the need for specialist equipment were overcome in the preparation of the key fluorinated intermediates 2,2-difluoro-2-(2-pyridyl)ethylamine 3 and 2-aminomethyl-3-fluoropyridine 2. With minimal isolations
2-3-[(2,2-二氟-2-(2-吡啶基)乙基)氨基]-6-氯-2-氧代氢吡嗪基}-N-[(3-氟(2-吡啶基))的可扩展路线) 甲基]乙酰胺 1 描述了各种放大问题,以提供安全、有效和稳健的途径来制备数公斤量的化合物。在制备关键的氟化中间体 2,2-difluoro-2-(2-pyridyl) 过程中克服了使用昂贵且有毒的试剂,尤其是叠氮化钠、TMS-氰化物和 Deoxo-Fluor 以及对专业设备的需求乙胺 3 和 2-氨基甲基-3-氟吡啶 2。通过最少的分离和中间体的处理,以 36% 的总产率分离出凝血酶抑制剂 1。