HCID 19828445, compound → 1-[5,5-Bis(4-fluorophenyl)pentyl]-2-piperazinecarboxamide

Participants

Reaction Steps

A solution of 56.9 parts of 1-[5,5-bis(4-fluorophenyl)-4-pentenyl]-4-(phenylmethyl)-2-piperazinecarboxamide in 400 parts of methanol was hydrogenated in a Parr apparatus and at 50° C. with 5 parts of palladium-on-charcoal catalyst 10%. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated in vacuo. The residue was dissolved in 2-propanone and the whole was acidified with a mixture of hydrochloric acid and 2-propanol. After the addition of 2,2'-oxybispropane, the supernatant liquid was decanted and the precipitate was stirred in 2,2'-oxybispropane. The precipitated product was filtered off and dissolved in water. After washing with 2,2'-oxybispropane, the aqueous layer was treated with ammonium hydroxide and the product was extracted with trichloromethane. The extract was washed with a sodium chloride solution, dried, filtered and evaporated (under trichloromethane), yielding 35.2 parts (76.3%) of 1-[5,5-bis(4-fluorophenyl)pentyl]-2-piperazinecarboxamide as a residue (int. 34).

Provenance & Evidence