[CH2:1]([O:8][C:9]1[CH:24]=[CH:23][C:12]([O:13][C:14]2[CH:19]=[CH:18][C:17]([N+:20]([O-])=O)=[CH:16][N:15]=2)=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)(=O)C>CO.[Zn]>[CH2:1]([O:8][C:9]1[CH:24]=[CH:23][C:12]([O:13][C:14]2[N:15]=[CH:16][C:17]([NH2:20])=[CH:18][CH:19]=2)=[CH:11][CH:10]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=12-(4-Benzyloxyphenoxy)-5-nitropyridine (7.84 g, 24.32 mmol) and zinc (15.16 g, 231.8 mmol) were suspended in 300 ml of methanol. Under argon 5.2 ml of acetic acid were slowly added dropwise at room temperature. After 1 h the mixture was filtered and the filtrate was concentrated. The crude product obtained was further reacted without purification.
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