反应详情

3.00 g of 4-methylbenzoic acid was suspended in a mixed solvent of 30 mL of methylene chloride and 20 μL of N,N-dimethylformamide, to which 2.9 mL of oxalyl chloride was added dropwise at room temperature, and this suspension was stirred for 5.5 hours at room temperature. Then, 1.79 g of monomethylamine hydrochloride was added to the reaction mixture, to which 15.4 mL of triethylamine was added dropwise in an ice bath, and the mixture was stirred for one hour at room temperature. The reaction mixture, to which water was added, was adjusted to pH 3 with 6M hydrochloric acid, and then the organic phase was separated therefrom. After the resultant organic phase was washed with water and a saturated sodium chloride solution successively, the washed phase was dried over anhydrous magnesium sulfate, and the solvent was distilled out under reduced pressure. The resultant residue was purified by silica gel column chromatography [eluent; chloroform:acetone=5:1] to yield 2.11 g of N,4-dimethylbenzamide as light orange solid.

1. additionwas added dropwise at room temperature
2. additionwas added dropwise in an ice bath
3. stirringthe mixture was stirred for one hour at room temperature
4. customthe organic phase was separated
5. washAfter the resultant organic phase was washed with water
6. dry with materiala saturated sodium chloride solution successively, the washed phase was dried over anhydrous magnesium sulfate
7. distillationthe solvent was distilled out under reduced pressure
8. customThe resultant residue was purified by silica gel column chromatography [eluent; chloroform:acetone=5:1]