Reaktion #340637

Reaktionsgleichung

2-chloromethyl-1H-benzoimidazole

4-(1H-benzoimidazol-2-ylmethoxy)-5-chloro-2-fluoro-benzaldehyde

2-Chloro-4-hydroxy-5-methoxy-benzaldehyde

2-chloro-4-hydroxy-5-methoxy-benzaldehyde

N,N-dimethylformamide

sodium hydride

→

4-(1H-benzoimidazol-2-ylmethoxy)-2-chloro-5-methoxy-benzaldehyde

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenThe reaction was concentrated in vacuo to an oil
2. 2
   workup.ADDITIONEthyl acetate was added
3. 3
   Waschenwashed with saturated sodium bicarbonate and brine
4. 4
   TrocknenThe organic layer was dried over anhydrous sodium sulfate
5. 5
   Filtrationfiltered
6. 6
   EinengenThe filtrate was concentrated
7. 7
   Sonstigepurified by silica gel column chromatography
8. 8
   Wascheneluting with 30-70% ethyl acetate in hexane over 30 minutes
9. 9
   Sonstigeto provide a white solid (137, 1.79 g, 46%)

Vorschrift

2-Chloro-4-hydroxy-5-methoxy-benzaldehyde (136, 2.30 g, 0.0123 mol) was dissolved in N,N-dimethylformamide (89.5 mL, 1.16 mol) and sodium hydride (60% dispersion in mineral oil, 541 mg, 0.0135 mol) was added. After 20 minutes, 2-chloromethyl-1H-benzoimidazole (106, 2.05 g, 0.0123 mol) was added to the reaction. The reaction was stirred at 80° C. overnight. The reaction was concentrated in vacuo to an oil. Ethyl acetate was added and washed with saturated sodium bicarbonate and brine. The organic layer was dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated and purified by silica gel column chromatography eluting with 30-70% ethyl acetate in hexane over 30 minutes to provide a white solid (137, 1.79 g, 46%). MS (ESI) [M+H+]+=317.1, 319.1.

Quelle