[Cl:1][C:2]1[CH:3]=[C:4]([N:11]2[CH2:16][CH2:15][N:14]([C:17](=[O:19])[CH3:18])[CH2:13][CH2:12]2)[CH:5]=[CH:6][C:7]=1[N+:8]([O-])=O>C(O)C>[NH2:8][C:7]1[CH:6]=[CH:5][C:4]([N:11]2[CH2:16][CH2:15][N:14]([C:17](=[O:19])[CH3:18])[CH2:13][CH2:12]2)=[CH:3][C:2]=1[Cl:1]The compound prepared in Step 1 was dissolved in ethanol (10 ml) and distilled water (1.0 ml), added with iron (powder, 2.0 g) and ammonium chloride (1.0 g), and stirred at 90° C. for 2 hours. Then, the resultant was filtered using celite and the filtrate was distilled under reduced pressure to remove the solvent. The resulting white solid was used in the subsequent reaction without further purification.
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