Water → 4-Azidobutanoic Acid

Temperatur

0 °C

Ethyl 4-azidobutyrate (8.06 g, 51.3 mmol) and KOH (14.4 g, 0.256 mol) were dissolved into a mixture of 100 ml of water and 120 ml of MeOH. The solution was stirred at 0° C. for 2 hrs and then MeOH was removed in vacuo. The aqueous layer was extracted by CHCl3 (50 ml), acidified to pH=1 by 2N aqueous HCl and extracted by Et2O (2×100 ml). The organic layers were combined, washed with water (100 ml) and dried over Na2SO4. After filtration and evaporation of solvent, 4-azidobutyric acid (5.30 g, 80%) was obtained as a colorless oil. p 4-Azidobutyric acid (2.00 g, 15.5 mmol) in 15 ml of toluene was treated with oxalyl chloride (4.92 g, 38.7 mmol). The mixture was stirred at 50° C. for 10 hrs. After removal of toluene in vacuo, crude 4-azidobutyric chloride was used for next reaction without further purifications.

1. customMeOH was removed in vacuo
2. extractionThe aqueous layer was extracted by CHCl3 (50 ml)
3. extractionextracted by Et2O (2×100 ml)
4. washwashed with water (100 ml)
5. dry with materialdried over Na2SO4
6. filtrationAfter filtration and evaporation of solvent

ORD-Eintrag

ord-0402bc5472e340be98824fcb17e95185

Quelldatensatz

uspto-grants-2001_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06310076B1