Hydrochloric Acid → 3-{[(Benzyloxy)carbonyl]amino}butanoic acid

To a mixture of 3-aminobutyric acid (0.52 g), 2 mol/L aqueous sodium hydroxide solution (10 mL) and tetrahydrofuran (10 mL) was added benzyloxycarbonyl chloride (1.07 mL), and the mixture was stirred at room temperature overnight. The reaction mixture was poured into 2 mol/L hydrochloric acid, and the resulting mixture was extracted with ethyl acetate. The extract was washed with water and brine, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure. The residue (solid) was treated with n-hexane. The crystals were collected by filtration, washed with n-hexane and dried under reduced pressure to give 3-benzyloxycarbonylaminobutyric acid (0.59 g). This material was dissolved in tetrahydrofuran (5 mL). To the solution was added 1,1′-carbonylbis-1H-imidazole (0.59 g), and the mixture was stirred at room temperature for 1 hour. To the reaction mixture was added 28% aqueous ammonia solution (5 mL), and the mixture was stirred at room temperature for 1 hour. The reaction mixture was diluted with diethylether. The insoluble material was collected by filtration, washed with water and diethyl ether, and dried under reduced pressure to give 3-benzyloxycarbonylaminobutyramide (0.54 g). The obtained 3-benzyloxycarbonylaminobutyramide (76 mg) was dissolved in methanol (3 mL). To the solution was added 10% palladium-carbon powder (20 mg), and the mixture was stirred at room temperature under a hydrogen atmosphere for 2 hours. The insoluble material was removed by filtration, and the filtrate was concentrated under reduced pressure to give the title compound (32 mg).

1. extractionthe resulting mixture was extracted with ethyl acetate
2. washThe extract was washed with water and brine
3. dry with materialdried over anhydrous sodium sulfate
4. customThe solvent was removed under reduced pressure
5. additionThe residue (solid) was treated with n-hexane
6. filtrationThe crystals were collected by filtration
7. washwashed with n-hexane
8. customdried under reduced pressure

ORD record

ord-ee2c869aec754014990d678a586fec63

Source dataset

uspto-grants-2009_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07635684B2