Sodium Hydroxide → 1-(3,5-Dichlorophenyl)-2-(5-trifluoromethyl-2-pyridinyl)ethanone oxime

A reaction vessel was charged with sodium hydride (as a 60% oil dispersion, 5.52 g, 138 mmol), DME (23 ml) and 2-chloro-5-trifluoromethylpyridine (7.06 g, 42 mmol). 3,5-Dichloroacetophenone (8.3 g, 44 mmol) in DME (23 ml) was added in portions to the mixture under nitrogen at room temperature. The mixture was stirred at ambient temperature for one hour then at 40-45° C. overnight. Upon completion of the reaction, the mixture was cooled to 5° C. and 10% aqueous sodium hydroxide solution (23 ml) was slowly added to the reaction mixture followed by methanol (46 ml) then hydroxylamine hydrochloride (14.5 g, 210 mmol). The mixture was heated to 72° C. for 4 hours then cooled and diluted with water (1500 ml) with stirring. The resulting solid was removed by filtration and dried under vacuum. It was then slurried in cyclohexane (100 ml) then filtered, washing with further cyclohexane. The crude solid 13.30 g (86%) was used in subsequent reactions without further purification.

1. customat 40-45° C.
2. customovernight
3. customUpon completion of the reaction
4. temperaturethe mixture was cooled to 5° C.
5. temperatureThe mixture was heated to 72° C. for 4 hours
6. temperaturethen cooled
7. stirringwith stirring
8. customThe resulting solid was removed by filtration
9. customdried under vacuum
10. filtrationthen filtered
11. washwashing with further cyclohexane
12. customThe crude solid 13.30 g (86%) was used in subsequent reactions without further purification

ORD record

ord-10a9254f46e647df941f2df14af1ab08

Source dataset

uspto-grants-2004_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06756498B2