Hydrogen Bromide → 1-(2-Bromopyridin-4-yl)-2-(4-fluorophenyl)ethanone

HRID 429200

Reaktionsgleichung

Cl[C:2]1[CH:7]=[C:6]([C:8](=[O:19])[CH:9](C#N)[C:10]2[CH:15]=[CH:14][C:13]([F:16])=[CH:12][CH:11]=2)[CH:5]=[CH:4][N:3]=1.[BrH:20]>C(=O)(O)[O-].[Na+]>[Br:20][C:2]1[CH:7]=[C:6]([C:8](=[O:19])[CH2:9][C:10]2[CH:15]=[CH:14][C:13]([F:16])=[CH:12][CH:11]=2)[CH:5]=[CH:4][N:3]=1

Komponenten

Reaktionsbedingungen

Temperatur: 135 °C

Versuchsvorschrift

To 1-(2-chloropyridin-4-yl)-2-cyano-2-(4-fluorophenyl)ethanone (22.0 g, 80 mmol) was added 48% hydrobromic acid (75 ml) and the reaction mixture was heated at reflux in an oil bath at 135° C. After 4 h, the reaction mixture was allowed to cool to room temperature and then further cooled in an ice bath. Saturated sodium bicarbonate (100 ml) was carefully added, followed by solid portions of sodium bicarbonate until the pH of the reaction mixture was neutral. The reaction mixture was then extracted with ethyl acetate and the ethyl acetate layer was dried over sodium sulfate, filtered and concentrated to a brown semi-solid (2.8 g). The crude product was purified by flash chromatography on silica gel, eluting with 1:1 mixture of ethyl acetate/hexanes to give 1-(2-bromopyridin-4-yl)-2-(4-fluorophenyl)ethanone (1.9 g).

Aufarbeitung

temperaturethe reaction mixture was heated
temperatureto cool to room temperature
temperaturefurther cooled in an ice bath
extractionThe reaction mixture was then extracted with ethyl acetate
dry with materialthe ethyl acetate layer was dried over sodium sulfate
filtrationfiltered
concentrationconcentrated to a brown semi-solid (2.8 g)
customThe crude product was purified by flash chromatography on silica gel
washeluting with 1:1 mixture of ethyl acetate/hexanes

Quellen und Nachweise

ORD-Eintrag: ord-eab152bfa51b4349aa18c7d849f7cdb2
Quelldatensatz: uspto-grants-2001_11
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US06316464B1

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