1,5-Dibromopentane → HCID 54274067, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.866 g (2.51 mmol) of 6-hydroxy-2,5-quinolinedipropanoic acid ethyl ester from the preceding example, 2.33 g (10.1 mmol) of 1,5-dibromopentane, 1.75 g (12.7 mmol) of anhydrous granular potassium carbonate and 25 mL of 2-butanone was stirred at 90° C. for 8.25 hr and at room temperature for another 37 hr. The mixture was filtered through anhydrous magnesium sulfate and the solids were washed with ethyl acetate. The filtrate and washes were combined and concentrated under reduced pressure. The residue was dissolved in 200 mL of ethanol, 1.21 g (6.36 mmol) of p-toluenesulfonic acid monohydrate was added and the resulting solution was stirred at room temperature for 22 hr. Most of the ethanol was removed under reduced pressure. The residue was treated with saturated aqueous sodium bicarbonate and worked-up with ethyl acetate in the usual manner. The crude product was partially purified by flash chromatography on 110 g of silica gel, eluting with hexane-ethyl acetate (3:1 and 2:1) giving 1.03 g of the title compound.

Provenance & Evidence