Process for the preparation of 6-(2,3-dichlorophenyl)-1,2,4-triazine-3,5-diamine, commonly known as lamotrigine
申请人:RPG Life Sciences Limited
公开号:US06639072B1
公开(公告)日:2003-10-28
A process for the preparation of 6-(2,3-dichlorophenyl)-1,2,4-triazine-3-5-diamine (lamotrigine) of the formula I:
2,3-Dichloronitrobenzene in C1-C6 aliphatic alkanol is hydrogenated at 55-90 psi gas pressure using metal catalyst at 27-35° C. 2,3-Dichloroaniline is diazotised and cyano-de-diazonised with metal cyanide at 65-80° C. 2,3-Dichlorobenzonitrile is hydrolysed and 2,3-dichlorobenzoic acid is chlorinated at 55-130° C. Cyano-de-halogenation of 2,3-dichlorobenzoyl chloride is carried out with a metal cyanide and alkali metal iodide by refluxing in an aprotic solvent under an inert atmosphere. 2,3-Dichlorobenzoyl cyanide is condensed with aminoguanidine bicarbonate in an organic solvent in acidic conditions using catalyst at 90-125° C. followed by insitu cyclisation of the Schiff's base by refluxing in an aliphatic alkanol with base. Crude lamotrigine is purified.
一种制备6-(2,3-二氯苯基)-1,2,4-三嗪-3,5-二胺(拉莫三嗪)的方法:将2,3-二氯硝基苯在C1-C6脂肪族烷醇中,在27-35°C下,在55-90 psi气压下使用金属催化剂进行氢化。2,3-二氯苯胺经重氮化和氰基-重氮化,在65-80°C下与金属氰化物反应。2,3-二氯苯甲腈经水解,2,3-二氯苯甲酸在55-130°C下氯化。2,3-二氯苯甲酰氯的氰基-脱卤反应是通过在无水溶剂中在惰性气氛下与金属氰化物和碱金属碘化物回流进行的。2,3-二氯苯甲酰氰与氨基胍碳酸氢盐在有机溶剂中,在90-125°C下在酸性条件下使用催化剂进行缩合,随后在脂肪族烷醇中与碱进行原位Schiff碱的环化。粗拉莫三嗪经过纯化。