[Cl:1][C:2]1[CH:37]=[CH:36][C:5]([C:6]([N:8]2[CH2:14][C:13]3[CH:15]=[CH:16][C:17]([O:19]C)=[CH:18][C:12]=3[N:11]([CH2:21][C:22]3[CH:27]=[CH:26][C:25]([C:28]([N:30]4[CH2:34][CH:33]=[CH:32][CH2:31]4)=[O:29])=[CH:24][CH:23]=3)[C:10](=[O:35])[CH2:9]2)=[O:7])=[CH:4][CH:3]=1.[Br-].[Br-].[Br-].B>ClCCl>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([C:6]([N:8]2[CH2:14][C:13]3[CH:15]=[CH:16][C:17]([OH:19])=[CH:18][C:12]=3[N:11]([CH2:21][C:22]3[CH:27]=[CH:26][C:25]([C:28]([N:30]4[CH2:31][CH:32]=[CH:33][CH2:34]4)=[O:29])=[CH:24][CH:23]=3)[C:10](=[O:35])[CH2:9]2)=[O:7])=[CH:36][CH:37]=179 mg (0.15 mmol) of 4-(4-chlorobenzoyl)-1-[4-(2,5-dihydro-1H-pyrrol-1-ylcarbonyl)benzyl]-8-methoxy-1,3,4,5-tetrahydrobenzo[e][1,4]-diazepin-2-on was dissolved in 10 ml of dichloromethane. 1.0 ml of borane tribromide was added to the obtained solution, and they were stirred at room temperature for 6 hours. After the treatment with dichloromethane as the extracting solvent by an ordinary method, the obtained crude product was treated in the same manner as in step 3 in Example 1 to obtain the title compound.
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