反应详情

To a solution of 4-iodo-2,6-dimethoxybezoic acid (308.0 mg, 1.00 mmol) in methylene chloride (5.0 mL) were added dimethylformamide (0.020 mL, 0.26 mmol) and oxalyl chloride (0.13 mL, 1.5 mmol), and the resulting mixture was stirred for 30 minutes. The reaction mixture was poured into an ice-cold solution of N,O-dimethylhydroxyamine hydrochloride (488.0 mg, 5.00 mmol) and N,N-diisopropylethylamine (1.74 mL, 10.0 mmol) in methylene chloride (5.0 mL). The ice bath was removed, and the mixture was stirred at room temperature for 30 minutes. 0.1 M Hydrochloric acid was added to the reaction mixture, and the resulting mixture was extracted with chloroform. The organic layer was washed with 0.1 M aqueous sodium hydroxide and brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. Hexane was added to the residue and the resulting precipitate was collected by filtration to yield crude 4-iodo-N,2,6-trimethoxy-N-methylbenzamide as a pale yellow crystalline powder (305.0 mg, yield: approx. 87%).

1. customThe ice bath was removed
2. stirringthe mixture was stirred at room temperature for 30 minutes
3. addition0.1 M Hydrochloric acid was added to the reaction mixture
4. extractionthe resulting mixture was extracted with chloroform
5. washThe organic layer was washed with 0.1 M aqueous sodium hydroxide and brine
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated under reduced pressure
8. additionHexane was added to the residue
9. filtrationthe resulting precipitate was collected by filtration