Gamma-Aminobutyric Acid → HCID 16770271, compound

To a solution of 20 gm (194 mMol) 4-aminobutyric acid in dichloromethane (700 ml) was added 56.8 ml (407 mMol) triethylamine and the mixture was stirred for 10 minutes. To the reaction mixture was then added a solution of 47.4 ml (388 mMol) isovaleryl chloride in dichloromethane (200 ml) dropwise and the resulting mixture was then stirred at room temperature for 2 hours. The reaction mixture was then filtered and the volatiles removed under reduced pressure. The residue was dissolved in 1N aqueous sodium hydroxide (150 ml) and the solution was stirred for 1.5 hours at room temperature. The aqueous solution was extracted with diethyl ether and the combined ether extracts were washed with water. All aqueous phases were combined and then acidified with concentrated hydrochloric acid. This mixture was then extracted well with ethyl acetate. These organic extracts were combined, dried over magnesium sulfate and concentrated under reduced pressure. The residue was slurried in hexane and the hexane decanted from the residue. Remaining residue was distilled in a bulb to bulb apparatus at 220° C. at 0.05 mmHg to give 8.0 g (22%) N-isovaleryl-4-aminobutyric acid.

1. stirringthe resulting mixture was then stirred at room temperature for 2 hours
2. filtrationThe reaction mixture was then filtered
3. customthe volatiles removed under reduced pressure
4. dissolutionThe residue was dissolved in 1N aqueous sodium hydroxide (150 ml)
5. stirringthe solution was stirred for 1.5 hours at room temperature
6. extractionThe aqueous solution was extracted with diethyl ether
7. washthe combined ether extracts were washed with water
8. extractionThis mixture was then extracted well with ethyl acetate
9. dry with materialdried over magnesium sulfate
10. concentrationconcentrated under reduced pressure
11. customthe hexane decanted from the residue
12. distillationRemaining residue was distilled in a bulb to bulb apparatus at 220° C. at 0.05 mmHg

ORD record

ord-1ad6cf2c150d453e8dc43af84b71bc21

Source dataset

uspto-grants-1993_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05270328