HCID 54512700, compound → HCID 14277778, compound

Participants

Reaction Steps

7-(3-pyridyl)-7-(3,5,6-trimethyl-1,4-benzoquinon -2-yl)-6-heptenoic acid (2.5 g) was hydrogenated in the presence of 5% palladium-carbon (0.5 g) in acetic acid (20 ml) (the reaction completed in about 2 hours). The catalyst was removed, the solvent was concentrated, and water (10 ml) and methanol (40 ml) were added. This solution was neutralized by addition of a saturated solution of sodium hydrogen carbonate, and the hydroquinone derivative was oxidized by aeration. After completion of oxidation, the mixture was concentrated under reduced pressure and the product was extracted with chloroform. The organic phase was dried with magnesium sulfate and concentrated under reduced pressure. The residue was dissolved in ethyl acetate and purified with silica gel column chromatography [ethyl acetate-ethanol(9:1)] and recrystallized from a mixture of ethyl acetate-isopropyl ether, to give 7-(3-pyridyl)-7-(3,5,6-trimethyl-1,4-benzoquinon -2-yl)heptanoic acid (2.1 g).

Provenance & Evidence