Acetic Acid → HCID 20258988, compound

Participants

Reaction Steps

5-(4-Hydroxy-1-piperidyl)-6-fluoroquinaldine (3.7 g) was dissolved in a mixed solvent consisting of 100 ml of acetic acid and 10 ml of ethyl acetate, and 1 g of 5% palladium-carbon was added to the mixture which then was placed in a vitrified autoclave. The reaction mixture was stirred at room temperature under a hydrogen gas pressure of 5 kg/cm2 for 3 hours. After removing hydrogen gas the reaction mixture was taken out. After removing the catalyst, the content was concentrated to dryness, dissolved in 100 ml of chloroform and neutralized with 50 ml of an aqueous 5% sodium hydroxide solution. After separation and washing with 100 ml of water twice, the chloroform layer was dried and concentrated to dryness. To the residue were added 20 ml of hexane and 0.5 g activated carbon and the mixture was heated to dissolve. After removing activated carbon by filtration the hexane layer was cooled to precipitate crystals which then were collected to give 3.4 g of 5-(4-hydroxy-1-piperidyl)-6-fluoro-1,2,3,4-tetrahydroquinaldine.

Provenance & Evidence