申请人:Wadhwa Kumar Lalit
公开号:US20050209294A1
公开(公告)日:2005-09-22
The invention discloses an improved process for producing 4-(1H-1,2,4-triazol-1-ylmethyl)benzonitrile of Formula (Structure 2), an intermediate used in the manufacture of 4,4′-[1H-1,2,4-triazol-1-ylmethylene] bisbenzonitrile (Letrozole), the process comprising of reacting salt of 1,2,4-triazole of Formula (Structure 4) with α-halo substituted tolunitrile of Formula (Structure 3) in presence of dimethylformamide, wherein the X represents alkali metals selected from a group of Li, Na, or K, preferably Na and Y represents a halogen group selected from Cl, Br or I, preferably Br.
本发明公开了一种改进的4-(1H-1,2,4-三唑-1-基甲基)苯腈(结构式2)的制备过程,该中间体用于生产4,4′-[1H-1,2,4-三唑-1-亚甲基]双苯腈(来曲唑),该过程包括将1,2,4-三唑的盐(结构式4)与α-卤代取代的托卢腈(结构式3)在N,N-二甲基甲酰胺的存在下反应,其中X代表选自Li、Na或K的碱金属,优选Na,Y代表选自Cl、Br或I的卤素族,优选Br。