Benzoyl chloride → ethyl 2-benzoyl-3,3-dimethylbutanoate

Temperature

5 °C

Diisopropylamine (5.6 ml) was dissolved in tetrahydrofuran (56 ml), butyllithium (1.6M hexane solution, 25 ml) was added dropwise thereto at 5° C. with stirring under a nitrogen atmosphere, and the resulting mixture was stirred for 15 minutes. The reaction mixture was cooled to -70° C., and 3,3-dimethylbutyric acid ethyl ester (6.7 ml) was added dropwise thereto, followed by stirring of the resulting mixture for 10 minutes. Then, benzoyl chloride (2.3 ml) was added dropwise to the reaction mixture and the resulting mixture was stirred at the same temperature for 10 minutes. After the reaction, a saturated aqueous ammonium chloride solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with a saturated aqueous NaCl solution and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=20/1) to obtain the title compound (4.5 g, 91%) as a colorless oil.

1. stirringthe resulting mixture was stirred for 15 minutes
2. temperatureThe reaction mixture was cooled to -70° C.
3. stirringby stirring of the resulting mixture for 10 minutes
4. stirringthe resulting mixture was stirred at the same temperature for 10 minutes
5. customAfter the reaction
6. extractionthe mixture was extracted with ethyl acetate
7. washThe organic layer was washed with a saturated aqueous NaCl solution
8. dry with materialdried over anhydrous magnesium sulfate
9. filtrationAfter filtration
10. customthe solvent was evaporated under reduced pressure
11. customThe residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=20/1)

ORD record

ord-10a976ca13ba4e17a3d666398bdf0e44

Source dataset

uspto-grants-1999_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06005116