Reaktion #10825

Reaktionsgleichung

2-cyclopropyl-4-(2,4-dimethoxy-phenyl)-1H-imidazole

dichloromethyl methyl ether

→

5-(2-cyclopropyl-1H-imidazol-4-yl)-2,4-dimethoxy-benzaldehyde

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONThe reaction mixture was then poured into ice
2. 2
   Extraktionextracted with dichloromethane
3. 3
   WaschenThe combined solution of dichloromethane was washed with saturated solution of sodium bicarbonate, brine
4. 4
   Trocknendried over sodium sulfate
5. 5
   Einengenconcentrated

Vorschrift

Ex-105B: To a solution of 2-cyclopropyl-4-(2,4-dimethoxy-phenyl)-1H-imidazole (0.51 g, 2.09 mmol) was added dichloromethyl methyl ether (0.28 mL, 3.13 mmol) followed by addition of titanium tetrachloride (1.0M in dichloromethane, 8.4 mL, 8.4 mmol) dropwise at 0° C. The solution was allowed to warm up to ambient temperature and stir for 4.5 hours. The reaction mixture was then poured into ice. The aqueous layer was adjusted to pH 12 and extracted with dichloromethane. The combined solution of dichloromethane was washed with saturated solution of sodium bicarbonate, brine, dried over sodium sulfate and concentrated to afford 5-(2-cyclopropyl-1H-imidazol-4-yl)-2,4-dimethoxy-benzaldehyde which was used without further purification. 1H NMR (DMSO-d6) δ 13.95 (bs, 1H), 10.22 (s, 1H), 8.09 (s, 1H), 7.70 (s, 1H), 6.88 (s, 1H), 4.04 (s, 3H), 4.00 (s, 3H), 2.25 (m, 1H), 1.20 (m, 4H). MS m/z=245 ([M+H]+, 100%).

Quelle