[H-].[Na+].[N+:3]([C:6]1[CH:7]=[C:8]([NH:12][C:13](=[O:19])[O:14][C:15]([CH3:18])([CH3:17])[CH3:16])[CH:9]=[CH:10][CH:11]=1)([O-:5])=[O:4].[CH3:20]I>CN(C=O)C.O>[CH3:20][N:12]([C:8]1[CH:9]=[CH:10][CH:11]=[C:6]([N+:3]([O-:5])=[O:4])[CH:7]=1)[C:13](=[O:19])[O:14][C:15]([CH3:16])([CH3:18])[CH3:17]To a suspension of NaH (60% dispersion in mineral oil, 2.1 g, 41.8 mmol) in DMF (80 mL) at 0° C. was added a solution of tert-butyl 3-nitrophenylcarbamate (18) (8.3 g, 34.9 mmol) in DMF (50 mL). The mixture was stirred at 0° C. for 0.5 hour before CH3I (4.9 mL, 52.35 mmol) was added dropwise. The reaction mixture was stirred at room temperature for 2 hours, diluted with water (200 mL), and extracted with DCM (60 mL×3). The combined organic layer was washed with brine, dried over Na2SO4 and concentrated in vacuo to afford tert-butyl methyl(3-nitrophenyl)carbamate (19) 8.8 g as yellow solid (yield 100%). LC-MS (ESI): m/z (M+1) 253.
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