Water → 5-[4-[1-(4-Methylphenylsulfonyl)piperidin-4-yl]phenyl]pentanoic acid

Participants

Reaction Conditions

Reaction Steps

To a suspension of (3-carboxypropyl)triphenylphosphonium bromide (16.5 g) in THF (170 ml) was added at room temperature potassium t-butoxide (8.63 g), and the mixture was stirred at 60° C. for 10 minutes and then cooled to room temperature. To the mixture was added a solution of 4-[1-(4-methylphenylsulfonyl)piperidin-4-yl]benzaldehyde (4.40 g) in THF (20 ml), and the mixture was stirred at 60° C. for 1 hour. To the mixture was added water (80 ml) and the mixture was extracted with toluene (80 ml). To the aqueous layer was added 1N hydrochloric acid to make the solution pH 3, and the mixture was extracted with ethyl acetate. The organic layer was washed three times with 2% sodium bicarbonate solution, and then with 1N hydrochloric acid and saturated brine (×3). Under reduced pressure, the mixture was concentrated, and the residue was dissolved in THF (150 ml). To the mixture was added Pd—C (0.5 g), and the mixture was stirred under hydrogen atmosphere for 5 hours. By filtration Pd—C was removed, and the filtrate was concentrated under reduced pressure. The resulting crystals were collected by filtration, which were washed with hexane to give colorless crystals of 5-[4-[1-(4-methylphenylsulfonyl)piperidin-4-yl]phenyl]pentanoic acid (4.63 g).

Provenance & Evidence