申请人:MacDonald Lindsay Peter
公开号:US20070066831A1
公开(公告)日:2007-03-22
The invention provides a high-yield process for the preparation of letrozole having a high purity, without the need for removal of the 4-[1-(1,3,4-triazolyl)methyl]benzonitrile impurity at the intermediate stage. The invention also provides a process for the synthesis of letrozole in which formation of the impurity 4-[1-(1,3,4-triazolyl)methyl]benzonitrile during the first stage is minimized. In the process, a 4-(halomethyl)benzonitrile is reacted with a salt of 1H-1,2,4-triazole, reducing the formation of the impurity. Preferably, the preparation is conducted as a one-pot process.
本发明提供了一种高产率、高纯度的来曲唑制备工艺,无需在中间阶段去除4-[1-(1,3,4-三唑基)甲基]苯腈杂质。本发明还提供了一种来曲唑的合成工艺,其中在第一阶段形成的杂质4-[1-(1,3,4-三唑基)甲基]苯腈的最小化。在过程中,将4-(卤代甲基)苯腈与1H-1,2,4-三唑盐反应,减少杂质形成。优选地,该制备过程作为一锅法进行。