[Br:1][C:2]1[CH:20]=[CH:19][C:5]([NH:6][CH2:7][C:8]2[CH:18]=[CH:17][C:11]3[N:12]=[C:13]([S:15][CH3:16])[O:14][C:10]=3[CH:9]=2)=[C:4]([N+:21]([O-])=O)[CH:3]=1.CC(O)=O.CO>C(Cl)Cl.[Zn]>[Br:1][C:2]1[CH:3]=[C:4]([NH2:21])[C:5]([NH:6][CH2:7][C:8]2[CH:18]=[CH:17][C:11]3[N:12]=[C:13]([S:15][CH3:16])[O:14][C:10]=3[CH:9]=2)=[CH:19][CH:20]=1
To a stirred solution of 4-bromo-N-((2-(methylthio)benzo[d]oxazol-6-yl)methyl)-2-nitroaniline (704 mg, 1.79 mmol), HOAc (2.1 mL) and methanol (2.1 mL) in DCM (18 mL) at 0° C. was added zinc dust (1.16 g, 17.9 mmol) portionwise. After stirring for 2 h, the mixture was filtered. The filtrate was washed with aq NaHCO3 and brine. The organic layer was dried over NaSO4, filtered and concentrated under reduced pressure to give 4-bromo-N1-((2-(methylthio)benzo[d]oxazol-6-yl)methyl)benzene-1,2-diamine (469 mg, 71.9%) as a yellow solid. 1H NMR (300 MHz, DMSO-d6) δ 7.72-7.60 (m, 2H), 7.53 (d, J=5.4 Hz, 1H), 6.68 (s, 1H), 6.49 (d, J=1.8 Hz, 1H), 6.23 (d, J=8.1 Hz, 1H), 5.36 (t, 1H), 4.90 (s, 2H), 4.38 (d, J=6.0 Hz, 2H), 2.74 (s, 3H). LCMS (ESI) m/z 365 (M+H)+.
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