申请人:Ray Purna Chandra
公开号:US20090062550A1
公开(公告)日:2009-03-05
The present invention provides a method for preparing pure Rizatriptan benzoate having purity more than 99.5% and dimer impurity less than 0.1% comprises, i) Condensation of 1,2,4-Triazole with 4-Nitro benzyl bromide to yield 1-(4-nitrophenyl)methyl-1,2,4-triazole ii) Reducing the 1-(4-nitrophenyl)methyl-1,2,4-triazole to give 1-(4-aminophenyl)methyl-1,2,4-triazole iii) Converting 1-(4-aminophenyl)methyl-1,2,4-triazole to 1-(4-hydrazinophenyl)methyl-1,2,4-triazole hydrochloride iv) Condensing the hydrazine derivative with 4-(Dimethylamino) butanal diethylacetal to get Rizatriptan and v) Salification of Rizatriptan to Rizatriptan benzoate.
本发明提供了一种制备纯度大于99.5%且二聚体杂质小于0.1%的纯利扎替普坦苯甲酸盐的方法,包括:i)将1,2,4-三唑与4-硝基苄基溴缩合,得到1-(4-硝基苯基)甲基-1,2,4-三唑;ii)还原1-(4-硝基苯基)甲基-1,2,4-三唑,得到1-(4-氨基苯基)甲基-1,2,4-三唑;iii)将1-(4-氨基苯基)甲基-1,2,4-三唑转化为1-(4-肼基苯基)甲基-1,2,4-三唑盐酸盐;iv)将肼衍生物与4-(二甲氨基)丁醛二乙基缩酮缩合,得到利扎替普坦;v)将利扎替普坦盐化为利扎替普坦苯甲酸盐。