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    • 6. 发明申请
    • Novel process for preparing pramipexole and its optical isomeric mixture by reduction with sodium triacetoxyborohydride
    • 用三乙酰氧基硼氢化钠还原制备普拉克索及其光学异构体混合物的新方法
    • US20060148866A1
    • 2006-07-06
    • US11299752
    • 2005-12-13
    • Guangxin XiaYifeng NianTiema YanJin SuoMichael BrandOded Arad
    • Guangxin XiaYifeng NianTiema YanJin SuoMichael BrandOded Arad
    • C07D277/82A61K31/428
    • C07D277/82
    • A novel process is provided for producing pramipexole base or its optical isomeric mixture as defined hereinabove i.e. (R,S)-2-amino-6-propyl-4,5,6,7-tetrahydrobenzothiazole avoiding the use of borane tetrahydrofuran complex and using a more convenient reducing agent like sodium triacetoxyborohydride instead. The provided process comprises reacting the starting material (S)-2,6-diamino-4,5,6,7-tetrahydrobenzothiazole or its optical isomeric mixture as defined hereinabove i.e. (R,S)-2,6-diamino-4,5,6,7-tetrahydrobenzothiazole with propionaldehyde in an organic solvent to obtain the respective enamine, which is subsequently reduced in situ, optionally without isolation, to obtain pramipexole or its optical isomeric mixture as defined hereinabove i.e. (R,S)-2-amino-6-propyl-4,5,6,7-tetrahydrobenzothiazole, and the acid addition salts thereof. The present invention also provides a process for purifying pramipexole dihydrochloride or the dihydrochloride salt of its optical isomeric mixture as defined hereinabove i.e. (R,S)-2-amino-6-propyl-4,5,6,7-tetrahydrobenzothiazole dihydrochloride by re-crystallization from a suitable solvent.
    • 提供了一种制备普拉克索碱或其如上所述的光学异构体混合物的新方法,即(R,S)-2-氨基-6-丙基-4,5,6,7-四氢苯并噻唑,避免使用硼烷四氢呋喃络合物并使用 一种更方便的还原剂,如三乙酰氧基硼氢化钠。 所提供的方法包括使起始原料(S)-2,6-二氨基-4,5,6,7-四氢苯并噻唑或其如上文所定义的光学异构体混合物即(R,S)-2,6-二氨基-4, 5,6,7-四氢苯并噻唑与丙醛在有机溶剂中反应,得到各自的烯胺,其随后可原位还原,任选不分离,得到如上所述的普拉克索或其旋光异构体混合物,即(R,S)-2- 氨基-6-丙基-4,5,6,7-四氢苯并噻唑及其酸加成盐。 本发明还提供了纯化普拉克索二盐酸盐或其如上所述的光学异构体混合物的二盐酸盐的方法,即(R,S)-2-氨基-6-丙基-4,5,6,7-四氢苯并噻唑二盐酸盐, - 从合适的溶剂中结晶。