[O:1]=[C:2]1[NH:8][C:7]2[CH:9]=[C:10]([CH3:13])[CH:11]=[CH:12][C:6]=2[NH:5][CH2:4][CH:3]1[NH:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16].[C:22](Cl)(=[O:24])[CH3:23].N1C=CC=CC=1.O>ClCCCl>[O:1]=[C:2]1[NH:8][C:7]2[CH:9]=[C:10]([CH3:13])[CH:11]=[CH:12][C:6]=2[N:5]([C:22](=[O:24])[CH3:23])[CH2:4][CH:3]1[NH:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16]2-Oxo-3-tert-butoxycarbonylamino-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (2.00 g) obtained from Referential Example 7 was suspended in 1,2-dichloroethane (40 ml), acetyl chloride (0.56 ml) and pyridine (0.64 ml) were added thereto, the mixture was refluxed for 2 hours. Water (100 ml) was added, extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium bicarbonate, dried over anhydrous sodium sulfate, the solvent was evaporated under reduced pressure, and diisopropyl ether was added to the residue for trituration, collectedly filtration, to thereby obtain 1.33 g of the titled compound.
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