[BH4-].[Na+].[CH3:3][O:4][C:5]1[CH:25]=[CH:24][C:8]([C:9](=[O:23])[CH2:10][N:11]2[C:15]3[CH:16]=[CH:17][CH:18]=[CH:19][C:14]=3[N:13]3[CH2:20][CH2:21][N:22]=[C:12]23)=[CH:7][CH:6]=1.[ClH:26]>CO>[ClH:26].[OH:23][CH:9]([C:8]1[CH:7]=[CH:6][C:5]([O:4][CH3:3])=[CH:25][CH:24]=1)[CH2:10][N:11]1[C:15]2[CH:16]=[CH:17][CH:18]=[CH:19][C:14]=2[N:13]2[CH2:20][CH2:21][N:22]=[C:12]12Add 0.3 g (7.5 mmol) of sodium borohydride bit by bit to a suspension of 2.41 g (7 mmol) of 9-(4'-methoxyphenacyl)-2,3-dihydroimidazo[1,2-a]benzimidazole--described in Example 6--in 15 ml of methanol over a period of thirty minutes at room temperature. Continue stirring for a further four hours and leave until the next day. Subsequently, add 10 ml of 10% hydrochloric acid until a pH of 2-3 is obtained, and evaporate the methanol. Treat the residue with an ammonium hydroxide solution and extract with chloroform. Recrystallise the residue. The title compound is obtained in the form of a base. Dissolve in hot ethanol and add ethereal hydrogen chloride. Allow to cool, suction-filter, and wash with ether. The title compound is obtained.
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