C(OC(=O)[NH:7][C:8]1[CH:13]=[C:12]([N+:14]([O-:16])=[O:15])[C:11]([Br:17])=[C:10]([CH3:18])[CH:9]=1)(C)(C)C.C(O)(C(F)(F)F)=O.[OH-].[Na+]>C(Cl)Cl>[Br:17][C:11]1[C:12]([N+:14]([O-:16])=[O:15])=[CH:13][C:8]([NH2:7])=[CH:9][C:10]=1[CH3:18](4-Bromo-3-methyl-5-nitro-phenyl)-carbamic acid tert-butyl ester (1000 mg, 2.9 mmol) was dissolved into DCM (10 mL). To this was added TFA (10 mL) and the reaction was stirred at RT for 1 hour. The pH was adjusted to 8 with 1 N NaOH and the solvents were removed in vacuo. The reaction mixture was dissolved into EtOAc and the layers were separated. The organic layers were dried (MgSO4) and the solvents were removed in vacuo resulting in title compound (756 mg, quantitative) as a brown oil. 1H-NMR (CDCl3): δ 8.44 (s, 1H), 8.02 (s, 1H), 7.61 (s, 1H), 3.05 (s, 3H).
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