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    • 3. 发明申请
    • Process for obtaining cetirizine dihydrochloride
    • 获得西替利嗪二盐酸盐的方法
    • US20090030205A1
    • 2009-01-29
    • US12220219
    • 2008-07-22
    • Massimiliano LussanaEnrico ViganoEnrica Pizzatti
    • Massimiliano LussanaEnrico ViganoEnrica Pizzatti
    • C07D241/04
    • C07D295/088
    • Process for the synthesis of cetirizine dihydrochloride, wherein (a) a solution of {2-[4-(α-phenyl-p-chlorobenzyl)piperazin-1-yl]}ethanol in 1-7 volumes, referred to the weight of {2-[4-(α-phenyl-p-chlorobenzyl)piperazin-1-yl]}ethanol, of an organic solvent having a boiling point higher than 90° C. and being chosen from the group consisting of aliphatic, cycloalifatic or aromatic solvents is provided, whereafter (b) per equivalent of {2-[4-(α-phenyl-p-chlorobenzyl)piperazin-1-yl]}ethanol employed, 1-2 equivalents of a metal haloacetate or of haloacetic acid, as well as 3-7 equivalents of an alkaly metal hydroxyde are added to the solution as per (a), providing a reaction mixture, where 0.05-0.3 volumes, referred to the weight of {2-[4-(α-phenyl-p-chlorobenzyl)piperazin-1-yl]}ethanol employed, of water and 0.1-1.2 volumes, referred to the weight of {2-[4-(α-phenyl-p-chlorobenzyl)piperazin-1-yl]}ethanol employed, of a polar aprotic, water miscible solvent are added, keeping the internal temperature of the reaction mixture below 60° C., whereafter (c) the cetirizine base formed within the reaction mixture is converted into its dihydrochloride salt and isolated as such.
    • 合成西替利嗪二盐酸盐的方法,其中(a){1-7]体积的{2- [4-(α-苯基 - 对 - 氯苄基)哌嗪-1-基]}乙醇溶液,称为{ 2- [4-(α-苯基 - 对氯苄基)哌嗪-1-基]乙醇,沸点高于90℃的有机溶剂,选自脂肪族,环芳族或芳香族 提供溶剂,然后(b)每当量使用的{2- [4-(α-苯基 - 对氯苄基)哌嗪-1-基]}乙醇,1-2当量的卤代乙酸金属盐或卤代乙酸作为 并且按照(a)将3-7当量的烷基金属氢氧化物加入到溶液中,得到反应混合物,其中0.05-0.3体积,称为{2- [4-(α-苯基-p - 氯苄基)哌嗪-1-基]}乙醇,水和0.1-1.2体积,称为{2- [4-(α-苯基 - 对氯苄基)哌嗪-1-基]}乙醇的重量 ,加入极性非质子,水混溶性溶剂, 将反应混合物的内部温度保持在60℃以下,然后(c)将反应混合物内形成的西替利嗪碱转化成其二盐酸盐并将其分离。