Ethyl isobutyrate → HCID 14302194, compound

Temperature

-78 °C

To a solution of diisopropylamine (4.36 g, 43.1 mmol) in 100 ml of anhydrous THF was added under argon atmosphere a solution of n-butyl lithium in hexane (1.61N, 26.8 ml, 43.1 mmol) at -20° C. The reaction mixture was stirred for one hour and cooled to -78° C. To the resulting mixture were added a solution of ethyl isobutyrate (5.00 g, 43.1 mmol) in anhydrous THF (15 ml) and HMPA (7.73 g, 43.1 mmol), and the mixture was stirred for 1.5 hrs. at -78° C. A solution of chloromethyl ethyl ether (4.89 g, 51.7 mmol) in 20 ml of anhydrous THF was added, stirred for 2 hrs. at -78° C., and then stirred for 2 hrs. at room temperature. To the resulting mixture were added an aqueous saturated solution of ammonium chloride (150 ml) and water (50 ml), and the mixture was extracted with ether (400 ml). The organic layer was washed with water (150 ml) and with brine, and dried over anhydrous magnesium sulfate. Ether was distilled out at normal pressure. Distillation of the resulting material (b.p. 80°-84° C./30 mmHg) gave ethyl 2,2-dimethyl-4-oxahexanoate (4.23 g, 24.3 mmol, 56.4%) as an oily material. The product was assigned the structure by the following data.

1. stirringthe mixture was stirred for 1.5 hrs
2. customat -78° C
3. stirringstirred for 2 hrs
4. stirringat -78° C., and then stirred for 2 hrs
5. customat room temperature
6. extractionthe mixture was extracted with ether (400 ml)
7. washThe organic layer was washed with water (150 ml) and with brine
8. dry with materialdried over anhydrous magnesium sulfate
9. distillationEther was distilled out at normal pressure
10. distillationDistillation of the resulting material (b.p. 80°-84° C./30 mmHg)

ORD record

ord-f5263c128f5d4b9da0b4dba819860125

Source dataset

uspto-grants-1988_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04775692