[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[CH:19]=[CH:18][C:17]([N+:20]([O-])=O)=[C:16]([F:23])[CH:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[Cl-].[NH4+]>C(O)C.O.[Fe]>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[CH:19]=[CH:18][C:17]([NH2:20])=[C:16]([F:23])[CH:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]The compound prepared in Step 1 was dissolved in ethanol (10 ml) and water (1.0 ml), added with iron (powder, 2.0 g) and ammonium chloride (1.0 g), and stirred at 80° C. for 2 hours. Then, the resultant was filtered with celite, distilled under reduced pressure to remove the solvent. The thus obtained target compound as a white solid was used in the subsequent reaction without further purification.
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