[C:1]([O:5][C:6]([N:8](C(OC(C)(C)C)=O)[C:9]1[CH:10]=[C:11]([C:16]([Br:19])=[CH:17][N:18]=1)[C:12](OC)=[O:13])=[O:7])([CH3:4])([CH3:3])[CH3:2].[NH3:27]>CO>[Br:19][C:16]1[C:11]([C:12](=[O:13])[NH2:27])=[CH:10][C:9]([NH:8][C:6](=[O:7])[O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[N:18][CH:17]=1A solution of methyl 2-(bis(tert-butoxycarbonyl)amino)-5-bromoisonicotinate (Intermediate 83, 100 g, 232 mmol) in 7 N ammonia in methanol (600 mL) was allowed to stir at 50° C. in a 1 L sealed tube overnight. The resulting mixture was evaporated to dryness and the crude product was directly used for the next step without further purification.
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