[N+:1]([C:4]1[CH:9]=[CH:8][C:7]([C:10]2[S:11][CH:12]=[CH:13][CH:14]=2)=[CH:6][C:5]=1[NH:15][C:16](=[O:25])[O:17][CH2:18][CH:19]1[CH2:24][CH2:23][CH2:22][CH2:21][CH2:20]1)([O-])=O.C([O-])=O.[NH4+]>CO.C1COCC1.[Zn]>[NH2:1][C:4]1[CH:9]=[CH:8][C:7]([C:10]2[S:11][CH:12]=[CH:13][CH:14]=2)=[CH:6][C:5]=1[NH:15][C:16](=[O:25])[O:17][CH2:18][CH:19]1[CH2:20][CH2:21][CH2:22][CH2:23][CH2:24]1To a stirred solution of cyclohexylmethyl (2-nitro-5-(thiophen-2-yl)phenyl)carbamate (0.09 g, 0.25 mmol, 1.0 equiv.) in methanol (5 mL) and THF (5 mL) were added Zn (0.08 mg, 1.25 mmol, 5.0 equiv.) and HCOONH4 (0.13 mmol, 2.0 mmol, 8.0 equiv.) at room temperature. The reaction mixture was stirred at room temperature for 4 h then filtered through celite and concentrated under reduced pressure. The crude residue was diluted with ethyl acetate, washed with water and brine. The combined organic layers were dried over sodium sulfate, filtered and concentrated. The crude residue was purified by column chromatography (silica gel, 30% EtOAc/hexanes) to afford cyclohexylmethyl (2-amino-5-(thiophen-2-yl)phenyl)carbamate (0.08 g, 100% yield). ESI+ MS: m/z 331 ([M+H]+), 1H NMR (500 MHz, d6-DMSO): δ 8.58 (bs, 1H), 7.52 (bs, 1H), 7.33 (d, J=4.5 Hz, 1H), 7.22-7.14 (m, 2H), 7.03 (dd, J=3.5, 5.0 Hz, 1H), 6.72 (d, J=8.0 Hz, 1H), 5.11 (s, 2H), 3.89 (d, J=6.5 Hz, 2H), 1.80-1.38 (m, 6H), 1.25-1.03 (m, 3H), 1.03-0.92 (m, 2H).
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