Potassium Carbonate → HCID 53779795, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.454 g (2.2 mmol) of 2,3-dihydro-7-hydroxy-8-propyl-4H-1-benzopyran-4-one, 1.09 g (2.2 mmol) of 2-[(5-bromopentyl)oxy]-7-(2-ethoxy-2-oxoethoxy)-1-naphthalenepropanoic acid ethyl ester from the preceding example, 1.23 g (8.9 mmol) of anhydrous granular potassium carbonate and 32.5 mL of 2-butanone was heated at 94° C. for 22 hr. After being cooled to room temperature, the mixture was filtered through some anhydrous magnesium sulfate. The solids were washed thoroughly with ethyl acetate and the filtrate and washes were combined and concentrated in vacuo. The residue was flash chromatographed on 200 g of silica gel, eluting with hexane-ethyl acetate (2:1) affording 1.11 g (81%) of the title compound as a white solid, mp 68°-69.5° C.

Provenance & Evidence