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A mixture of 0.64 g (3.59 mmol) of methyl 2-hydroxycinnamate, 6.6. g (28.7 mmol) of 1,5-dibromopentane, 2 g (14.5 mmol) of anhydrous, granular potassium carbonate, and 25 mL of acetonitrile was stirred and refluxed for 24 hr. The resulting slurry was cooled, diluted with ether, and filtered with suction. The solids were washed well with ether. The filtrate and washes were combined and concentrated under reduced pressure. The oily residue was flash chromatographed on silica gel, eluting with 5:1 hexane-ether giving 1 g (85%) of (E)-3-[2-[(5-bromopentyl)oxy]phenyl]-2-propenoic acid methyl ester as a solid.

1. temperaturerefluxed for 24 hr
2. temperatureThe resulting slurry was cooled
3. filtrationfiltered with suction
4. washThe solids were washed well with ether
5. concentrationconcentrated under reduced pressure
6. customchromatographed on silica gel
7. washeluting with 5:1 hexane-ether giving 1 g (85%) of (E)-3-[2-[(5-bromopentyl)oxy]phenyl]-2-propenoic acid methyl ester as a solid