[NH2:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:11]=1[NH:10][C:9](=[O:12])[CH2:8][CH2:7]2.Br.[Br:14][CH2:15][CH2:16][NH:17][CH2:18][CH2:19]Br.C(=O)([O-])[O-].[Na+].[Na+]>CO>[BrH:14].[N:1]1([C:2]2[CH:3]=[CH:4][CH:5]=[C:6]3[C:11]=2[NH:10][C:9](=[O:12])[CH2:8][CH2:7]3)[CH2:19][CH2:18][NH:17][CH2:16][CH2:15]18-Amino-3,4-dihydrocarbostyril (7.5 g, 46.2 mmols) and bis(β-bromoethyl)amine hydrobromide (15.9 g, 50.8 mmols) were suspended in methanol and the suspension was heated under reflux while stirring for 9 hours. After adding 2.5 g of sodium carbonate, the reaction mixture was further heated under reflux for 8 hours while stirring, and stirred on an ice bath for 1 hours. Crystals which precipitated were collected by filtration. The crude crystals thus obtained were recrystallized from methanol-ether to give 2.4 g of 8-(1-piperazinyl)-3,4-dihydrocarbostyril hydrobromide, m.p. above 300° C., colorless needles.
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