Dimethylformamide dimethyl acetal → (2E)-3-(dimethylamino)-1-[2-hydroxy-5-(trifluoromethyl)phenyl]prop-2-en-1-one
Reaktionsgleichung
[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([F:11])([F:10])[F:9])=[CH:4][C:3]=1[C:12](=[O:14])[CH3:13].CO[CH:17](OC)[N:18]([CH3:20])[CH3:19]>>[CH3:17][N:18]([CH3:20])/[CH:19]=[CH:13]/[C:12]([C:3]1[CH:4]=[C:5]([C:8]([F:9])([F:10])[F:11])[CH:6]=[CH:7][C:2]=1[OH:1])=[O:14]Komponenten
3
Reaktionsbedingungen
- Temperatur
- 110 °C
Versuchsvorschrift
1-[2-Hydroxy-5-(trifluoromethyl)phenyl]ethanone, (Preparation 860, 7.0 g, 0.0343 mol) was taken in dimethylformamide dimethylacetal (18.2 mL, 0.137 mol) at room temperature and then heated at 110° C. for 30 min. The reaction mixture was concentrated in vacuo and the crude product was crystallised from 2-propanol to give the title compound as bright yellow solid (6.4 g).