申请人:American Cyanamid Company
公开号:US05064963A1
公开(公告)日:1991-11-12
The invention provides a novel process for producing N-[3-(1H-imidazol-1-yl)phenyl]-4-(substituted)-2 pyrimidinamine compounds in which the substituent is a 2-pyridinyl, 3-pyrindinyl, 4-pyridinyl, 2-furanyl or 2-thienyl group. The process includes the steps of (1) reacting a 3-(1H-imidazol-1-yl)benzamine with cyanamide and a halogen acid while controlling the pH of the reaction between pH about 2 to abourt 3.5 and recovering a [3-(1H-imidazol-1-yl)phenyl] guanidine dihydrohalide and (2) reacting the [3-(1H-imidazol-1-yl)phenyl] guanidine dihydrohalide so recovered with an appropriately substituted 3-dimethylamino-1-(substituted)-2-propen-1-one and a base at a pH of from about 10.5 to about 11.5 and recovering the N-[3-(1H-imidazol-1-yl)phenyl-4-(substituted)-2-pyrimidamine compound so produced. The novel process provides improved yield and purity by adhering to the stated crucial pH ranges.
该发明提供了一种新型的生产N-[3-(1H-咪唑-1-基)苯基]-4-(取代基)-2-嘧啶胺化合物的方法,其中取代基是2-吡啶基、3-吡啶基、4-吡啶基、2-呋喃基或2-噻吩基。该方法包括以下步骤:(1)在控制反应的pH在约2到约3.5之间的条件下,将3-(1H-咪唑-1-基)苯胺与氰胺和一种卤酸反应,从中回收[3-(1H-咪唑-1-基)苯基]胍二氢卤化物;(2)将回收的[3-(1H-咪唑-1-基)苯基]胍二氢卤化物与适当取代的3-二甲胺基-1-(取代基)-2-丙烯-1-酮和碱在pH约为10.5到约11.5的条件下反应,从中回收所生产的N-[3-(1H-咪唑-1-基)苯基]-4-(取代基)-2-嘧啶胺化合物。这种新型方法通过遵循所述关键的pH范围提高了产量和纯度。