Reaktion #1925688

Reaktionsgleichung

Hydroxylamine hydrochloride

sodium acetate

2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone

→

2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone oxime

Ausbeute 53.0%

Lösungsmittel

water

ethanol

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe mixture was heated
2. 2
   Temperaturat reflux for 1 hour
3. 3
   Temperaturcooled
4. 4
   Einengenthe mixture concentrated to half its volume
5. 5
   workup.ADDITIONDilute HCl was added
6. 6
   Extraktionthe mixture extracted with dichloromethane (1×100 mL), 3×50 mL)
7. 7
   WaschenThe combined extracts were washed with dilute sodium bicarbonate
8. 8
   Trocknendried with magnesium sulfate
9. 9
   Einengenconcentrated
10. 10
    Sonstigeto give a light yellow oil, that
11. 11
    Sonstigewas crystallized from ethyl acetate/hexanes

Vorschrift

Hydroxylamine hydrochloride (5.5 g, 0.079 mol) and sodium acetate (6.5 g, 0.079 mol) were added to a slurry of 2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone in ethanol (120 mL) and water (30 mL). The mixture was heated and held at reflux for 1 hour, then cooled and allowed to stir for 18 hours at room temperature. Additional water (50 mL) was added, and the mixture concentrated to half its volume. Dilute HCl was added, and the mixture extracted with dichloromethane (1×100 mL), 3×50 mL). The combined extracts were washed with dilute sodium bicarbonate, dried with magnesium sulfate, and concentrated to give a light yellow oil, that was crystallized from ethyl acetate/hexanes to afford 2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone oxime as white solid (6.2 g, 53%). A second crop (2.3 g, 73% net yield) was also collected. 1H NMR (CDCl3/400 MHz) 7.57-7.60 (m, 2H), 7.35-7.37 (m, 3H), 6.80-6.84 (m, 1.7H), 6.75-6.77 (m, 0.3H), 4.14 (s, 1.7H), 3.83 (s, 0.3H), 2.39 (s, 3H). HRMS m/z 244.0773 (M+H+, calcd 244.0764). Anal. Calcd for C15H13F2NOS: C, 61.42; H, 4.47; N, 4.78; Found: C, 61.44; H, 4.50, N 4.84.

Quelle