Cl.[NH2:2][CH:3]1[CH2:12][C:11]2[C:6](=[C:7]([N+:14]([O-:16])=[O:15])[CH:8]=[C:9]([Br:13])[CH:10]=2)[NH:5][C:4]1=[O:17].CN(C=O)C.C(N(CC)CC)C.[C:30](=O)([O:36]C(C)(C)C)[O:31][C:32]([CH3:35])([CH3:34])[CH3:33]>O>[Br:13][C:9]1[CH:10]=[C:11]2[C:6](=[C:7]([N+:14]([O-:16])=[O:15])[CH:8]=1)[NH:5][C:4](=[O:17])[CH:3]([NH:2][C:30](=[O:36])[O:31][C:32]([CH3:35])([CH3:34])[CH3:33])[CH2:12]2
3-Amino-6-bromo-8-nitro-3,4-dihydroquinolin-2(1H)-one hydrochloride (610 g) was added to N,N-dimethylformaldehyde (3 L), and triethylamine (554 mL) was added dropwise to the mixture under cooling on ice. Subsequently, di-tert-butyl carbonate (454 g) was added thereto, and the resultant mixture was stirred at room temperature for 30 minutes. Water (3 L) was added to the reaction mixture, and stirring was performed for 30 minutes under cooling on ice. The precipitates were recovered through filtration and washed sequentially with water and diisopropyl ether. The thus-obtained solid was dried, whereby the title compound (674 g) was yielded as a powdery compound.
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