反应详情

Into a 1-L 3-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed a solution of 4-nitrobenzoic acid (167 g, 999.29 mmol, 1.00 equiv) in dichloromethane (400 mL) and ClCOCOCl (317.5 g, 2.50 equiv). This was followed by the addition of N,N-dimethylformamide (1 mL) dropwise with stirring. The resulting solution was stirred for 4 h at room temperature. The mixture was concentrated under vacuum. To the residue was added a solution of PhNH2 (93 g, 1.00 equiv) in dichloromethane (400 mL), triethylamine (415 mL, 3.00 equiv) dropwise with stirring at 0° C. The resulting solution was stirred overnight at room temperature. The resulting mixture was washed with 2×500 mL of HCl (10%) and 1×500 mL of brine. The mixture was dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was diluted with 500 mL of petroleum ether/ethyl acetate=5:1. The solids were collected by filtration. This resulted in 205 g (85%) of 4-nitro-N-phenylbenzamide as light yellow solid. 1H NMR (300 MHz, DMSO-d6) δ 7.12-7.17 (m, 1H), 7.32-7.41 (m, 2H), 7.78-7.81 (m, 2H), 8.16-8.21 (m, 2H), 8.36-8.42 (m, 2H), 10.58 (s, 1H); MS (ESI) m/z 243 ([M+H]+).

1. customInto a 1-L 3-necked round-bottom flask purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. stirringThe resulting solution was stirred for 4 h at room temperature
4. concentrationThe mixture was concentrated under vacuum
5. stirringwith stirring at 0° C
6. stirringThe resulting solution was stirred overnight at room temperature
7. washThe resulting mixture was washed with 2×500 mL of HCl (10%) and 1×500 mL of brine
8. dry with materialThe mixture was dried over anhydrous sodium sulfate
9. concentrationconcentrated under vacuum
10. additionThe residue was diluted with 500 mL of petroleum ether/ethyl acetate=5:1
11. filtrationThe solids were collected by filtration
12. customThis resulted in 205 g (85%) of 4-nitro-N-phenylbenzamide as light yellow solid