反应详情

To a stirred mixture of 2-hydroxy-4-nitrobenzonitrile (4 g, 24.37 mmol) and cesium carbonate (11.91 g, 36.6 mmol) in DMF (40 mL) was added tert-butyl 3-bromopropylcarbamate (8.71 g, 36.6 mmol) at room temperature. The reaction mixture was stirred at room temperature for 18 h. The solvent was removed under reduced pressure and the residue was taken in ethyl acetate (250 mL), washed with brine (2×100 mL). The organic layer was dried over anhydrous sodium sulphate and concentrated in vacuo to give tert-butyl 3-(2-cyano-5-nitrophenoxy)propylcarbamate (5 g, 63.8%) as a yellow solid. LC-MS (M+H)+=321.2. 1H NMR (400 MHz, CDCl3) δ ppm 7.89-7.87 (1H, m), 7.81 (1H, s), 7.75 (1H, d, J=8.4 Hz), 4.76 (1H, br s), 4.27-4.24 (2H, t, J=6.4 Hz), 3.40-3.36 (2H, q, J=6.4, 12.8 Hz), 2.15-2.09 (2H, m), 1.43 (9H, s).

1. customThe solvent was removed under reduced pressure
2. washwashed with brine (2×100 mL)
3. dry with materialThe organic layer was dried over anhydrous sodium sulphate
4. concentrationconcentrated in vacuo