Reaktion #168804

Reaktionsgleichung

Bromoacetaldehyde diethyl acetal

cesium carbonate

N,N-dimethylacetamide

5,6-dichloropyridin-3-ol

→

2,3-dichloro-5-(2,2-diethoxyethoxy)pyridine

Ausbeute 88.4%

Lösungsmittel

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Waschenthe organic layer was washed with water
2. 2
   Trocknendried over anhydrous sodium sulfate
3. 3
   Einengenconcentrated under reduced pressure
4. 4
   SonstigeThe obtained residue was purified by silica gel column chromatography (Biotage, hexane:ethyl acetate=11:1 to 9:1)

Vorschrift

Bromoacetaldehyde diethyl acetal (2.74 ml, 18.3 mmol) and cesium carbonate (9.93 g, 30.5 mmol) were added to an N,N-dimethylacetamide solution (10 ml) of 5,6-dichloropyridin-3-ol (1.0 g, 6.10 mmol), and stirred under a nitrogen atmosphere at 100° C. for 16 hours. Saline solution and ethyl acetate were added to the reaction solution, the organic layer was washed with water, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (Biotage, hexane:ethyl acetate=11:1 to 9:1) to obtain 2,3-dichloro-5-(2,2-diethoxyethoxy)pyridine (1.51 g, yield: 88%) as an orange oil.

Quelle