申请人:Lussana Massimiliano
公开号:US20090030205A1
公开(公告)日:2009-01-29
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.
盐酸西替利嗪的合成过程,其中
(a) 在一种有沸点高于90°C的有机溶剂中提供2-[4-(α-苯基-p-氯苄基)哌嗪-1-基]}乙醇的1-7倍体积的溶液,所述有机溶剂选自脂肪族、环脂族或芳香族溶剂组成的群体,然后
(b) 每当使用2-[4-(α-苯基-p-氯苄基)哌嗪-1-基]}乙醇的当量时,向所述溶液中添加1-2当量的金属卤代乙酸盐或卤代乙酸,以及3-7当量的碱金属氢氧化物,形成反应混合物,其中向所述(a)中的溶液中添加0.05-0.3倍体积的水和0.1-1.2倍体积的极性无水剂,保持反应混合物的内部温度低于60°C,然后
(c) 在反应混合物中形成的西替利嗪碱转化为其盐酸二水合物盐并作为此类盐分离。