HCID 54397227, compound → HCID 54427333, compound

Participants

Reaction Steps

To a solution of 3.91 g (11.6 mmol) of 3-(3-ethoxy-3-oxopropyl)-4-hydroxy-δ-oxobenzenepentanoic acid ethyl ester (from example 140) in 50 mL of acetic acid was added 0.5 g of 10% palladium on carbon, and the resulting mixture was shaken at room temperature and 45 p.s.i. in a Parr shaker for 18.5 hr. The mixture was filtered with suction through a Celite pad and the solids washed with ethyl acetate. The filtrate and washes were combined and concentrated in vacuo. The residue was dissolved in 200 mL of ethanol and treated with 5 mL of concentrated sulfuric acid. The resulting mixture was refluxed for 4 hr and then stirred at room temperature overnight. Most of ethanol was removed in vacuo and the residue was worked-up with ether in the usual manner (the combined ether extracts were additionally washed with saturated aqueous sodium bicarbonate solution). The crude product was purified by flash chromatography on 350 g of silica gel, eluting with hexane-ethyl acetate (4:1) to give 2.13 g (56.7%) of the title compound as a colorless oil.

Provenance & Evidence