反应详情

To a suspension of 4-n-pentyloxybenzoic acid (5.0 g) in toluene was added oxalyl chloride (15 ml) and N,N-dimethylformamide (0.1 ml) and the mixture was stirred for 2 hours at room temperature. The solvents were evaporated under reduced pressure to give crude 4-n-pentyloxybenzoyl chloride. To a suspension of N,O-dimethylhydroxylamine a hydrochloride (3.51 g) and pyridine (5.82 ml) in tetrahydrofuran (25 ml) was added the solution of crude 4-n-pentyloxybenzoyl chloride in tetrahydrofuran (25 ml) dropwise at 0° C. and the mixture was stirred for 3 hours at room temperature. To the reaction mixture 1N HCl was added and extracted with ethyl acetate. The organic layer was separated, washed with water and brine, dried over magnesium sulfate and evaporated under reduced pressure to give N-(4-n-pentyloxybenzoyl)-N,O-dimethylhydroxylamine (4.63 g).

1. customThe solvents were evaporated under reduced pressure
2. customto give crude 4-n-pentyloxybenzoyl chloride
3. stirringthe mixture was stirred for 3 hours at room temperature
4. extractionextracted with ethyl acetate
5. customThe organic layer was separated
6. washwashed with water and brine
7. dry with materialdried over magnesium sulfate
8. customevaporated under reduced pressure