Ethanol → HCID 54185689, compound

Participants

Reaction Steps

To a solution of 2.97 g (9.0 mmol) of [(2,3-dihydro-3-oxo-1H-naphtho[2,1-b]pyran-9-yl)oxy]acetic acid 1,1-dimethylethyl ester from the preceding example, in 120 mL of ethanol, was added 2 mL of concentrated sulfuric acid and the resulting solution was allowed to stir at room temperature for 13 days. Most of ethanol was removed under reduced pressure and the residue was dissolved in ether. The solution was washed with saturated aqueous sodium bicarbonate solution and work-up was completed in the usual manner. The crude product was purified by flash chromatography on 150 g silica gel, eluting with hexane-ethyl acetate (4:1). There was obtained 2.69 g (86.0%) of the title compound as a white solid, mp 112°-113° C.

Provenance & Evidence