[C:1](Cl)(=[O:5])[CH2:2][CH2:3][CH3:4].[NH2:7][C:8]1[CH:13]=[C:12]([O:14][C:15]2[CH:20]=[CH:19][C:18]([N+:21]([O-:23])=[O:22])=[CH:17][CH:16]=2)[CH:11]=[CH:10][N:9]=1.C(N(CC)CC)C.O1CCCC1>O>[C:1]([NH:7][C:8]1[CH:13]=[C:12]([O:14][C:15]2[CH:16]=[CH:17][C:18]([N+:21]([O-:23])=[O:22])=[CH:19][CH:20]=2)[CH:11]=[CH:10][N:9]=1)(=[O:5])[CH2:2][CH2:3][CH3:4]Butyroyl chloride (0.93 ml) was added dropwise to a stirred solution of 2-amino-4-(4-nitrophenoxy)pyridine (1.0 g), triethylamine (1.8 ml) and tetrahydrofuran (20 ml) at room temperature. After stirring for 1 hour, water was added, extraction was performed with ethyl acetate, the extract was dried over magnesium sulfate and the solvent was distilled off under reduced pressure. The residue was purified by silica gel chromatography (hexane:ethyl acetate=2:1) to obtain 0.6 g of the target substance as a colorless oil.
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