Hydrochloric Acid → (S)-3-(2-(4-phenyl-4-carboxypiperidin-1-yl)ethyl)-3-(3,4-dichlorophenyl)pyrrolidine

Combine (+)-1-(2-(3-(3,4-dichlorophenyl)-1-(3,4,5-trimethoxybenzoyl)-pyrrolidin-3-yl)-ethyl)-4-phenylpiperidine-4-carboxylic acid amide prepared by the method of U.S. Pat. No. 5,635,510, issued Jun. 3, 1997 (200 g, 300 mmol), dioxane (400 mL), concentrated aqueous hydrochloric acid (400 mL), and water (400 mL). Heat to reflux. After 26 hours, cool to ambient temperature and concentrate the reaction mixture in vacuo at about 60° C. to a volume of about 700 mL. Add water (400 mL) and extract with 9/1 ethyl acetate/hexaneo Separate the layers and extract the aqueous layer twice with 1/1 ethyl acetate/hexane. Adjust the pH of the aqueous layer to about 7 using sodium hydroxide to form a solid. Filter and dry to give (S)-3-(2-(4-phenyl-4-carboxypiperidin-1-yl)ethyl)-3-(3,4-dichlorophenyl)pyrrolidine.

1. temperatureHeat to reflux
2. concentrationconcentrate the reaction mixture in vacuo at about 60° C. to a volume of about 700 mL
3. extractionAdd water (400 mL) and extract with 9/1 ethyl acetate/hexaneo
4. customSeparate the layers
5. extractionextract the aqueous layer twice with 1/1 ethyl acetate/hexane
6. customto form a solid
7. filtrationFilter
8. customdry

ORD-Eintrag

ord-afac6f28e1fe4dd2a63e9071f55b752c

Quelldatensatz

uspto-grants-1999_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05977139