Process for the synthesis of high purity 3,5-diamino-6-(2,3-dichlorophenyl) (1,2,4-triazine)
申请人:Richter Gedeon Vegyeszeti Gyar. RT.
公开号:US07390899B2
公开(公告)日:2008-06-24
The present invention relates to a new process for the synthesis of high purity 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine of formula (I) using 2,3-dichlorobenzoyl cyanide and an aminoguanidine salt as starting materials. 2,3-dichlorobenzoyl cyanide is reacted with 1-2 mol equivalent of aminoguanidine salt in 3-6 mol equivalent of methanesulfonic acid, then the obtained adduct of formula (IV) is transformed without isolation into the product with magnesium oxide. In given case the obtained crude product can be recrystallized from a proper organic solvent
本发明涉及一种新的合成高纯度3,5-二氨基-6-(2,3-二氯苯基)-1,2,4-三嗪(式(I))的方法,使用2,3-二氯苯甲酰氰和氨基胍盐作为起始物质。2,3-二氯苯甲酰氰与1-2摩尔当量的氨基胍盐在3-6摩尔当量的甲磺酸中反应,然后将得到的配合物(式(IV))在不分离的情况下与氧化镁转化为产物。在给定情况下,得到的粗产品可以从适当的有机溶剂中重结晶。