Successful Development and Scale-up of a Palladium-Catalysed Amination Process in the Manufacture of ZM549865
作者:Graham E. Robinson、Oliver R. Cunningham、Mouloud Dekhane、Julie C. McManus、Anne O'Kearney-McMullan、Abdurrazzaque M. Mirajkar、Vikas Mishra、Alison K. Norton、B. Venugopalan、Emyr G. Williams
DOI:10.1021/op0499369
日期:2004.11.1
Key steps in the synthesis of ZM549865 (a 5-HT receptor antagonist) are the palladium-catalysed amination of ethyl 8-bromo-6-fluoro-4-oxo-4H-2-chromenecarboxylate and subsequent hydrolysis of the ester group. The development of a simple, robust process capable of making multikilogram amounts of the required intermediate is described. Performing the amination step at 125 °C instead of 80 °C and optimising
ZM549865(一种 5-HT 受体拮抗剂)合成的关键步骤是钯催化的 8-溴-6-氟-4-氧代-4H-2-色烯甲酸乙酯胺化和酯基的后续水解。描述了一种简单、稳健的工艺的开发,该工艺能够制备数公斤量的所需中间体。在 125 °C 而不是 80 °C 下进行胺化步骤并优化水解条件导致总产率从 44% 增加到约 70%,并将反应时间从几天缩短到几小时。色酮环最初是通过 2-溴-4-氟苯酚与乙炔二甲酸二甲酯反应然后环化来构建的。开发了一种可能更便宜的路线,包括通过 Fries 重排形成取代的苯乙酮,