Hexachloroethane → 2-Chloro-5-(4-(trifluoromethyl)phenyl)oxazole

Temperatur

-78 °C

LiHMDS (1.06 M in THF, 28.59 mL, 30.3 mmol) was added to a solution of 5-(4-(trifluoromethyl)phenyl)oxazole 30 (5.38 g, 25.25 mmol) in THF (100 mL) at −78° C., and the mixture was stirred at −78° C. for 1 h. A solution of hexachloroethane (8.96 g, 37.87 mmol) in THF (10 mL) was added at −78° C., and the mixture was stirred at −78° C. for 2 h and allowed to warm to room temperature and stirred for 14 h. The reaction was quenched by adding EtOAC:H2O (50 mL:15 mL), and then extracted with Ethyl acetate. The extracts were washed with brine, dried (Na2SO4) and concentrated. The product was purified by column chromatography (Acetone/hexane as an eluent) to provide 2-chloro-5-(4-(trifluoromethyl)phenyl)oxazole 31 (6.05 g, 97% yield) as white solid. MS (ES) m/z 248 (M+H+).

1. stirringthe mixture was stirred at −78° C. for 2 h
2. temperatureto warm to room temperature
3. stirringstirred for 14 h
4. customThe reaction was quenched
5. additionby adding EtOAC
6. extractionH2O (50 mL:15 mL), and then extracted with Ethyl acetate
7. washThe extracts were washed with brine
8. dry with materialdried (Na2SO4)
9. concentrationconcentrated
10. customThe product was purified by column chromatography (Acetone/hexane as an eluent)

ORD-Eintrag

ord-0547554ce7da4226a49f033ac5ebd668

Quelldatensatz

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08546400B2