C([N:8]1[CH2:14][C:13]2[N:15]=[CH:16][C:17]([N:19]3[CH2:24][CH2:23][CH2:22][CH2:21][CH:20]3[CH3:25])=[N:18][C:12]=2[O:11][CH2:10][CH2:9]1)C1C=CC=CC=1.C(OCC)(=O)C.[ClH:32]>CO.[OH-].[OH-].[Pd+2]>[ClH:32].[CH3:25][CH:20]1[CH2:21][CH2:22][CH2:23][CH2:24][N:19]1[C:17]1[CH:16]=[N:15][C:13]2[CH2:14][NH:8][CH2:9][CH2:10][O:11][C:12]=2[N:18]=1To a solution of 8-benzyl-3-(2-methylpiperidin-1-yl)-6,7,8,9-tetrahydropyrazino[2,3-f][1,4]oxazepine (0.65 g) in methanol (20 mL) was added 20% Pd(OH)2/C (0.13 g), and the mixture was stirred under a hydrogen atmosphere at 50° C. for 2.5 hr. The reaction mixture was filtered, and the filtrate was concentrated. To a solution of the obtained crude product in ethyl acetate (20 mL) was added a 4 N hydrogen chloride-ethyl acetate solution (628 μL) and the mixture was stirred for 30 min. The reaction mixture was filtered, and the obtained crystals were purified by recrystallization (methanol-ethyl acetate) to give the title compound (0.40 g, 73%) as a pale-yellow powder.
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