[Cl:1][C:2]1[CH:17]=[CH:16][C:5]([O:6][C:7]2[CH:8]=[C:9]([CH:13]=[CH:14][CH:15]=2)[C:10](Cl)=[O:11])=[C:4]([N+:18]([O-:20])=[O:19])[CH:3]=1.[NH4+:21].[OH-]>O>[Cl:1][C:2]1[CH:17]=[CH:16][C:5]([O:6][C:7]2[CH:8]=[C:9]([CH:13]=[CH:14][CH:15]=2)[C:10]([NH2:21])=[O:11])=[C:4]([N+:18]([O-:20])=[O:19])[CH:3]=1The product from Example 168b (1.8 g, 6.13 mmol) was added to cold NH4OH (15 mL) and stirred for 1 h. The reaction was poured into water and extracted with ethyl acetate. The organic layer washed with water, brine, and dried over sodium sulfate, filtered and concentrated under vacuum to gave the title compound (1.66 g, 92%).
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