1,5-Dibromopentane → HCID 54246863, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 1.08 g (3.12 mmol) of 7-(2-ethoxy-2-oxoethoxy)-2-hydroxy-1-naphthalenepropanoic acid ethyl ester from the preceding example, 4.31 g (18.7 mmol) of 1,5-dibromopentane, 2.59 g (18.7 mmol) of anhydrous granular potassium carbonate, and 70 mL of 2-butanone was heated at 65° C. for 24 hr. After being cooled to room temperature, the mixture was filtered through anhydrous magnesium sulfate. The solids were washed thoroughly with ethyl acetate and the filtrate and washes were combined and concentrated in vacuo. To the residue was added 60 mL of ethanol and 1 mL of concentrated sulfuric acid and the resulting solution was stirred at room temperature for 17.5 hr. Most of the ethanol was removed under reduced pressure and the residue was flash chromatographed on 110 g of silica gel, eluting with hexane-ethyl acetate (6:1) to give 1.15 g (74.4%) of the title compound as an off-white, waxy solid, mp 29.5°-32° C.

Provenance & Evidence