Hydrochloric Acid → 1-(4-Bromo-1-naphthalenyl)-3-(3,5-dichlorophenyl)-4,4,4-trifluoro-3-hydroxy-1-butanone

Temperature

-78 °C

Lithium diisopropylamide (Aldrich Chemical Company, 2M in tetrahydrofuran/ethylbenzene, 4 mL, 7.94 mmol) was added to tetrahydrofuran (4 mL) at −78° C. A solution of 1-(4-bromo-1-naphthalenyl)ethanone (1.8 g, 7.22 mmol) in tetrahydrofuran (4 mL) was added dropwise to the mixture. When the addition was complete the mixture was stirred for 30 min at −78° C. Then a solution of 1-(3,5-dichlorophenyl)-2,2,2-trifluoroethanone (1.75 g, 7.20 mmol) in tetrahydrofuran (4 mL) was added dropwise to the mixture at such a rate that the temperature of the reaction mixture did not exceed −55° C. The mixture was allowed to warm to ambient temperature over 120 min. The mixture was then poured into 1N hydrochloric acid (100 mL) and extracted with ethyl acetate (2×100 mL). The combined extracts were dried and evaporated. Chromatography on silica gel (eluted with 1:9 ethyl acetate/hexanes) and crystallization from hexanes gave the title product as a white solid (1.1 g, 40% yield) melting at 74.5-75° C. (after recrystallization from hexanes).

1. additionWhen the addition
2. customdid not exceed −55° C
3. temperatureto warm to ambient temperature over 120 min
4. extractionextracted with ethyl acetate (2×100 mL)
5. customThe combined extracts were dried
6. customevaporated
7. customChromatography on silica gel (eluted with 1:9 ethyl acetate/hexanes) and crystallization from hexanes

ORD record

ord-6c5b52712fda4f8aaccb0e300c5ba0d8

Source dataset

uspto-grants-2013_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08513431B2