Dimethylformamide dimethyl acetal → 3-Dimethylamino-1-(2,4-dimethyl-thiazol-5-yl)-propenone
Reaktionsgleichung
[C:1]([C:4]1[S:8][C:7]([CH3:9])=[N:6][C:5]=1[CH3:10])(=O)[CH3:2].C[O:12][CH:13](OC)[N:14]([CH3:16])[CH3:15]>>[CH3:10][C:5]1[N:6]=[C:7]([CH3:9])[S:8][C:4]=1/[CH:1]=[CH:2]/[C:13]([N:14]([CH3:16])[CH3:15])=[O:12]Komponenten
3
Versuchsvorschrift
A solution of 5-acetyl-2,4-dimethylthiazole (10 g, 60 mmol) in N,N-dimethylformamide dimethylacetal (10 mL) was refluxed under N2. After 18 h, the reaction mixture was evaporated to dryness and the residue was recrystallised from iPr2O/CH2Cl2 to afford the title compound as a brown powder (9.94 g, 79%). 1H-NMR (300 MHz, CDCl3) δ2.66 (s, 6H, CH3), 2.70 (s, 6H, CH3), 5.37 (d, 1H, J=12.2 Hz, CH), 7.66 (d, 1H, J=12.2 Hz, CH).
Aufarbeitung
- customthe reaction mixture was evaporated to dryness
- customthe residue was recrystallised from iPr2O/CH2Cl2