申请人:Mendes Zita
公开号:US20090234154A1
公开(公告)日:2009-09-17
A process for producing tamsulosin of formula I
and pharmaceutically acceptable addition salts, thereof comprises the steps of:
a) Reacting compound R,R-[2-(4-methoxy-phenyl)-1-methyl-ethyl]-(1-phenyl-ethyl)-amine of formula II or a salt thereof
with chlorosulfonic acid with or without an organic solvent, to obtain compound R,R-2-methoxy-5-[2-(1-phenyl-ethylamino)-propyl]-benzenesulfonic acid of formula III
b) Hydrogenolysis of compound R,R-2-methoxy-5-[2-(1-phenyl-ethylamino)-propyl]-benzenesulfonic acid of formula III or a salt thereof carried out in an alcohol in the presence of a palladium catalyst using hydrogen or a source of hydrogen, to obtain compound R-(−)-5-(2-amino-propyl)-2-methoxy-benzenesulfonic acid of formula IV
c) Reacting primary amine R-(−)-5-(2-amino-propyl)-2-methoxy-benzenesulfonic acid of formula IV, or a salt thereof, with a compound of formula V
wherein X represents an halogen atom selected from the group consisting of Cl; Br and I, to obtain 5-(2R)-2-[2-(2-ethoxy-phenoxy)-ethylamino]-propyl}-2-methoxy-benzenesulfonic acid compound of formula VI
d) Reacting compound of formula VI with an halogenating agent, to obtain the corresponding sulfonylchloride of formula VII.
e) Reacting compound VII with ammonia to obtain compound I.
生产公式I的盐酸他唑嗪及其药用可接受盐的方法包括以下步骤:
a)将公式II化合物R,R-[2-(4-甲氧基苯基)-1-甲基乙基]-(1-苯基乙基)-胺或其盐与氯磺酸在有机溶剂的存在下或无机溶剂的缺席下反应,得到公式III的R,R-2-甲氧基-5-[2-(1-苯基乙基氨基)-丙基]-苯磺酸化合物。
b)在存在钯催化剂的情况下,使用氢气或氢源,在醇的存在下对公式III的R,R-2-甲氧基-5-[2-(1-苯基乙基氨基)-丙基]-苯磺酸化合物或其盐进行氢解反应,得到公式IV的R-(−)-5-(2-氨基丙基)-2-甲氧基苯磺酸化合物。
c)将公式IV的主要氨基R-(−)-5-(2-氨基丙基)-2-甲氧基苯磺酸化合物或其盐与公式V的化合物反应,其中X代表从Cl、Br和I组成的卤素原子,以得到公式VI的5-(2R)-2-[2-(2-乙氧基苯氧基)-乙基氨基]-丙基}-2-甲氧基苯磺酸化合物。
d)将公式VI的化合物与卤化试剂反应,得到相应的公式VII的磺酰氯。
e)将公式VII的化合物与氨反应,得到公式I的化合物。