Lithium Hydroxide → 3-Cyclopentyl-2-(3-fluoro-4-trifluoromethyl-phenyl)-propionic acid

HRID 1355115Notes

Reaction equation

C[O:2][C:3](=[O:22])[CH:4]([C:11]1[CH:16]=[CH:15][C:14]([C:17]([F:20])([F:19])[F:18])=[C:13]([F:21])[CH:12]=1)[CH2:5][CH:6]1[CH2:10][CH2:9][CH2:8][CH2:7]1.[OH-].[Li+]>O1CCCC1>[CH:6]1([CH2:5][CH:4]([C:11]2[CH:16]=[CH:15][C:14]([C:17]([F:18])([F:19])[F:20])=[C:13]([F:21])[CH:12]=2)[C:3]([OH:22])=[O:2])[CH2:10][CH2:9][CH2:8][CH2:7]1

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of 3-cyclopentyl-2-(3-fluoro-4-trifluoromethyl-phenyl)-propionic acid methyl ester (1.80 g, 5.69 mmol) in tetrahydrofuran (15 mL) was treated with a 0.8M aqueous lithium hydroxide solution (7.1 mL, 5.69 mmol). The reaction mixture was stirred at 25° C. for 15 h. The reaction mixture was concentrated in vacuo. The resulting residue was diluted with ethyl acetate (100 mL) and then washed with a 5% aqueous hydrochloric acid solution and a saturated aqueous sodium chloride solution. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230–400 mesh, 2/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-fluoro-4-trifluoromethyl-phenyl)-propionic acid (1.11 g, 64%) as a white solid: mp 93–95° C.; FAB-HRMS m/e calcd for C15H16F4O2 (M+H)+ 305.1165, found 305.1175.

Workup

concentrationThe reaction mixture was concentrated in vacuo
additionThe resulting residue was diluted with ethyl acetate (100 mL)
washwashed with a 5% aqueous hydrochloric acid solution
dry with materialThe organic layer was dried over magnesium sulfate
filtrationfiltered
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-f3b566ee63df4c8dbbd96185db6c05fe
Source dataset: uspto-grants-2007_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07223868B2

Reaction notes

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