[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([C:24](OC)=[O:25])=[C:6]2[C:10]=1[N:9]=[C:8]1[N:11]([C:16]3[C:21]([Cl:22])=[CH:20][C:19]([Cl:23])=[CH:18][N:17]=3)[CH2:12][CH2:13][CH2:14][CH2:15][N:7]21.[BH4-].[Li+]>O1CCCC1.C(OCC)(=O)C>[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:16]4[C:21]([Cl:22])=[CH:20][C:19]([Cl:23])=[CH:18][N:17]=4)[CH2:12][CH2:13][CH2:14][CH2:15][N:7]3[C:6]=2[C:5]([CH2:24][OH:25])=[CH:4][CH:3]=1To a stirred solution of methyl 10-chloro-1-(3,5-dichloropyridin-2-yl)-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazole-7-carboxylate (426 mg, 1.00 mmol) in tetrahydrofuran (10 mL) was added lithium borohydride (54.5 mg, 2.50 mmol) at 0° C. After being stirred for 30 h at room temperature, the reaction mixture was diluted with ethyl acetate, quenched with aqueous ammonium chloride, washed with water and brine, dried over sodium sulfate, filtrated, and concentrated in vacuo to get the title compound as colorless solid (376 mg, 0.946 mmol, 95%).
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