反应详情

10 g of 4-bromobutyric acid ethyl ester and 15 g of N-cyclohexyl-N-methylamine were added to 40 mL of ethanol, and the mixture was heated to reflux for 2 hours. After air-cooling, the mixture was concentrated under reduced pressure and extracted with 200 mL of ethyl acetate. The extracted material was washed with purified water, dried with magnesium sulfate, and then concentrated. The obtained residue was distilled under reduced pressure to give 10.5 g of N-cyclohexyl-N-methyl-gamma-aminobutyric acid ethyl ester. The obtained N-cyclohexyl-N-methyl-gamma-aminobutyric acid ethyl ester was added to a sodium hydroxide solution (2.4 g of sodium hydroxide/100 mL of purified water), and THF was added thereto until the mixture became homogeneous. After stirring at room temperature for 3 hours, the mixture was neutralized with DOWEX50W [H+ form] and concentrated under reduced pressure. The obtained residue was recrystallized to give 5.2 g of the desired product.

1. temperaturethe mixture was heated
2. temperatureto reflux for 2 hours
3. temperatureAfter air-cooling
4. concentrationthe mixture was concentrated under reduced pressure
5. extractionextracted with 200 mL of ethyl acetate
6. washThe extracted material was washed with purified water
7. dry with materialdried with magnesium sulfate
8. concentrationconcentrated
9. distillationThe obtained residue was distilled under reduced pressure