Sodium Hydroxide → 1-[4-(Methylthio)butyl]cyclopentanecarboxylic acid

Temperature

52.5 °C

To a solution of 1-[4-(methylthio)butyl]cyclopentanecarboxylic acid methyl ester (18.8 mmol, 4.94 g) in a mixture of THF (38 mL) and methanol (38 mL) was added 1 N sodium hydroxide (38 mL)and the mixture was heated to 50-55° C. for 15 h. TLC analysis of the reaction mixture did not detect the presence of starting ester and the reaction was cooled to room temperature. The volatiles were removed under reduced pressure and the residue was diluted with water (100 mL) and was extracted with diethyl ether (2×50 mL) to remove any neutral impurities. Then the separated aqueous layer was acidified with 1 N hydrochloric acid and the mixture was extracted with ethyl acetate (2×75 mL). The combined ethyl acetate extracts were washed with brine, dried (MgSO4), filtered, then concentrated in vacuo and the residue was dried under high vacuum to afford 4.31 g (92%) of 1-[4-(methylthio)butyl]cyclopentanecarboxylic acid as a low melting colorless solid. HR MS: Obs. mass, 216.1181. Calcd. mass, 216.1184, M+.

1. temperaturethe reaction was cooled to room temperature
2. customThe volatiles were removed under reduced pressure
3. additionthe residue was diluted with water (100 mL)
4. extractionwas extracted with diethyl ether (2×50 mL)
5. customto remove any neutral impurities
6. extractionthe mixture was extracted with ethyl acetate (2×75 mL)
7. washThe combined ethyl acetate extracts were washed with brine
8. dry with materialdried (MgSO4)
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. customthe residue was dried under high vacuum

ORD record

ord-1293c85b12bc4df5b8a305deb171998f

Source dataset

uspto-grants-2002_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06458844B2