C(OC(=O)[NH:7][CH2:8][C:9]1[N:10]([CH2:31][CH:32]([CH3:34])[CH3:33])[C:11](=[O:30])[C:12]2[C:17]([C:18]=1[O:19][CH2:20][CH2:21][CH2:22][CH3:23])=[CH:16][C:15]([C:24]1[S:25][CH:26]=[C:27]([CH3:29])[N:28]=1)=[CH:14][CH:13]=2)(C)(C)C.[ClH:36]>C(OCC)(=O)C>[ClH:36].[ClH:36].[NH2:7][CH2:8][C:9]1[N:10]([CH2:31][CH:32]([CH3:33])[CH3:34])[C:11](=[O:30])[C:12]2[C:17]([C:18]=1[O:19][CH2:20][CH2:21][CH2:22][CH3:23])=[CH:16][C:15]([C:24]1[S:25][CH:26]=[C:27]([CH3:29])[N:28]=1)=[CH:14][CH:13]=2Tert-butyl[4-butoxy-2-isobutyl-6-(4-methyl-1,3-thiazol-2-yl)-1-oxo-1,2-dihydro-3-isoquinolinyl]methylcarbamate (0.30 g, 0.6 mmol) was dissolved in a solution of 4N hydrogen chloride in ethyl acetate (5 ml) and the mixture was stirred at room temperature for 1 h. The reaction mixture was concentrated under reduced pressure, and the precipitated crystals were recrystallized from methanol-diisopropyl ether to give 3-(aminomethyl)-4-butoxy-2-isobutyl-6-(4-methyl-1,3-thiazol-2-yl)-1(2H)-isoquinolinone dihydrochloride (0.27 g, 96.4%) as crystals.
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