Lithium Hydroxide → 2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid

Temperature

25 °C

A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (10.02 g, 25.75 mol) in methanol (100 mL) and water (100 mL) was treated with lithium hydroxide (15.4 g, 515 mmol). The reaction mixture was stirred at 25° C. for 2 h. The reaction mixture was then concentrated in vacuo to remove methanol. The resulting aqueous residue was acidified to pH=2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (1×400 mL). The organic layer was washed with water (1×300 mL) and a saturated aqueous sodium chloride solution (1×300 mL). The organic layer was then dried over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (9.58 g, 99%) as a white solid which was used without further purification: mp 149-150° C.; FAB-HRMS m/e calcd for C15H19BrO4S (M+H)+ 375.0266, found 375.0274.

1. concentrationThe reaction mixture was then concentrated in vacuo
2. customto remove methanol
3. extractionextracted with ethyl acetate (1×400 mL)
4. washThe organic layer was washed with water (1×300 mL)
5. dry with materialThe organic layer was then dried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo

ORD record

ord-e535402300504fac83f6efd3b5cf5ce2

Source dataset

uspto-grants-2002_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06433188B1