反应详情

4-Iodo-3-methoxy-N-methylbenzamide. N,N-Dimethylformamide (0.1 mL) was added to a solution of 4-iodo-3-methoxybenzoic acid (2.0 g, 7.2 mmol) in sulfuryl dichloride (20 mL), and the mixture was heated to reflux for 2 h. The excess sulfuryl dichloride was removed under reduced pressure to give the crude product 4-iodo-3-methoxy-benzoyl chloride. To a solution of methyl amine (0.72 g, 10.8 mmol) and triethylamine (2.18 g, 21.6 mmol) in dichloromethane (20 mL) was added dropwise a solution of the above 4-iodo-3-methoxy-benzoyl chloride in dichloromethane (15 mL) at 0° C. After the reaction was completed, water was added, the organic layer was separated, dried over sodium sulfate evaporated to give the crude product, which was purified on silica gel column (eluting with 10-17% ethyl acetate in petroleum ether) to give 4-iodo-3-methoxy-N-methylbenzamide (0.92 g, 46% yield). 1H NMR (400 MHz, DMSO-d6) δ (ppm) 7.92 (d, J=8.0 Hz, 1H), 7.42 (d, J=5.6 Hz, 1H), 7.31 (dd, J1=8.0 Hz, J2=2.0 Hz, 1H), 3.88 (s, 3H).

1. temperaturethe mixture was heated
2. temperatureto reflux for 2 h
3. customThe excess sulfuryl dichloride was removed under reduced pressure