The present invention relates to an improved process for the preparation of the dihydrochloride monohydrate salt of (S)-2-amino-4,5,6,7-tetrahydro-6- (propylamino)benzothiazole (the compound of formula I) comprising reacting the compound of formula II with n-propanal and sodium borohydride using a mixture of methanol and dichloromethane (DCM) as the solvent to obtain the compound of formula I; followed by converting the compound of formula I into its monohydrochloride salt; purifying the monohydrochloride salt of the compound of formula I; and finally converting the pure monohydrochloride salt of the compound of formula I into the dihydrochloride monohydrate salt.
本发明涉及一种改进的制备(S)-2-
氨基-4,5,6,7-四氢-6-(丙基
氨基)
苯并噻唑的二盐酸盐一
水合物(化合物I)的过程,包括将化合物II与正
丙醛和
硼氢化钠在
甲醇和
二氯甲烷(DCM)的混合溶剂中反应以获得化合物I;然后将化合物I转化为其单盐酸盐;纯化化合物I的单盐酸盐;最后将纯净的化合物I的单盐酸盐转化为二盐酸盐一
水合物。