Reacción #3117

Ecuación de reacción

3,4-Dihydroxybenzaldehyde

methyl chlorodifluoroacetate

potassium carbonate

→

title compound

Rendimiento 38.0%

4-difluoromethoxy-3-hydroxybenzaldehyde

Rendimiento 38.0%

Disolventes

DMF

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroDMF was removed in vacuo
2. 2
   ExtracciónThe aqueous layer was extracted three times with ether
3. 3
   LavadoThe combined organic extracts were washed with water, with brine
4. 4
   Secadowere dried (MgSO4)
5. 5
   Filtraciónfiltered
6. 6
   Otroevaporated
7. 7
   OtroThe residue was purified by flash chromatography (silica gel, 25% ethyl acetate/hexanes)

Procedimiento

3,4-Dihydroxybenzaldehyde (0.50 g, 3.62 mmol, Aldrich), methyl chlorodifluoroacetate (0.52 g, 3.62 mmol, Aldrich) and potassium carbonate (0.50 g, 3.62 mmol) were combined in DMF (5.0 mL) under an argon atmosphere. After stirring at 60°-65° C. for 3 h, DMF was removed in vacuo and the residue was partioned between aqueous 3N HCl and ether. The aqueous layer was extracted three times with ether. The combined organic extracts were washed with water, with brine, were dried (MgSO4), filtered and evaporated. The residue was purified by flash chromatography (silica gel, 25% ethyl acetate/hexanes) to provide the title compound as a white solid (0.20 g, 38%). mp 83°-85° C.

Fuente