An efficient nine-step synthesis of 2-(2,2-difluoroethoxy)-6-trifluoromethyl- N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c] -pyrimidine-2-yl) benzenesulfonamide has been developed. The starting material 4-nitro-2-(trifluoromethyl)aniline starting material was converted via 2-bromo-4-amino-6-trifluoromethylaniline and 2-bromo-4-acetamido-6-trifluoro-methylbenzenesulfonic acid to 2-bromo-6-trilfuoromethylbenzenesulfonic acid. This was then combined with 2-amino-5,8-dimethoxy-1,2,4-triazolo[1.5-c]pyrimidine to give the target molecule. Compared with the reported method, this approach has advantages in its shorter reaction time, milder reaction conditions and easier purifiction. Moreover, the overall yield has been improved to 22.9% which is twice of that of the reported method.
2- (2,2-二氟乙氧基)-6-三氟甲基-N-(5,8-二甲氧基-1,2,4-三唑并[1,5-c] -嘧啶-2-基)苯磺酰胺的九步高效合成方法已经开发成功。起始原料 4-硝基-2-(三氟甲基)苯胺通过 2-溴-4-氨基-6-三氟甲基苯胺和 2-溴-4-乙酰胺基-6-三氟甲基苯磺酸转化为 2-溴-6-三氟甲基苯磺酸。然后将其与 2-氨基-5,8-二甲氧基-1,2,4-三唑并[1.5-c]嘧啶结合,得到目标分子。与已报道的方法相比,这种方法具有反应时间短、反应条件温和、易于纯化等优点。此外,总产率提高到 22.9%,是已报道方法的两倍。