Reacción #46459

Ecuación de reacción

1-Bromo-3-iodo-5-methyl-2-(3-phenylallyloxy)-benzene

sodium carbonate

sodium formate

→

3-benzyl-7-bromo-5-methyl-benzofuran

Rendimiento 52.7%

Disolventes

DMF

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe mixture was degassed
2. 2
   Temperaturacooled to room temperature
3. 3
   workup.ADDITIONWater was added
4. 4
   Extracciónthe mixture was extracted with a hexanes/ethyl acetate (1:1) mixture
5. 5
   OtroThe solution was dried onto 20 gm silica gel
6. 6
   Otrothe silica gel was layered over 100 gm silica gel in a fritted funnel
7. 7
   Lavadoeluted with four 400 ml portions of hexanes
8. 8
   OtroThe hexanes was removed under reduced pressure

Procedimiento

1-Bromo-3-iodo-5-methyl-2-(3-phenylallyloxy)-benzene (10.86 g, 25 mmol), tetrabutylammonium chloride (7.65 gm, 27.5 mmol), sodium carbonate (6.62 g, 62.46 mmol), sodium formate (1.7 g, 25 mmol), and bis(acetonitrile)dichloropalladium(II) (0.467 g, 1.8 mmol) was added to 50 ml DMF. The mixture was degassed and heated under nitrogen at 80° C. for 105 minutes, then cooled to room temperature. Water was added and the mixture was extracted with a hexanes/ethyl acetate (1:1) mixture. The solution was dried onto 20 gm silica gel, the silica gel was layered over 100 gm silica gel in a fritted funnel and eluted with four 400 ml portions of hexanes. The hexanes was removed under reduced pressure to give 3-benzyl-7-bromo-5-methyl-benzofuran (3.97 g, 52% yield). MS: (M+H)+ 302.

Fuente