Lithium hydroxide, monohydrate → (S)-2-[4-(2,6-difluoro-3-methoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid

HRID 19123Notes

Reaction equation

C[O:2][C:3](=[O:26])[C@@H:4]([N:9]1[CH2:13][C:12]([O:14][C:15]2[C:20]([F:21])=[CH:19][CH:18]=[C:17]([O:22][CH3:23])[C:16]=2[F:24])=[CH:11][C:10]1=[O:25])[CH2:5][CH:6]([CH3:8])[CH3:7].O.[OH-].[Li+]>O1CCCC1>[F:24][C:16]1[C:17]([O:22][CH3:23])=[CH:18][CH:19]=[C:20]([F:21])[C:15]=1[O:14][C:12]1[CH2:13][N:9]([C@@H:4]([CH2:5][CH:6]([CH3:8])[CH3:7])[C:3]([OH:26])=[O:2])[C:10](=[O:25])[CH:11]=1

Participants

Conditions

Temperature: 5 °C

Procedure

To a solution containing (S)-2-[4-(2,6-difluoro-3-methoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid methyl ester (0.254 g, 0.001 mol) in tetrahydrofuran (10 mL) was treated with an aqueous solution of lithium hydroxide monohydrate (0.5N, 3 mL, 0.002 mol). The mixture was stirred at 5° C. for 3 h, and the solvents evaporated. The residue was dissolved in water and washed with diethyl ether, and the diethyl ether layer discarded. The aqueous phase was acidified with dilute hydrochloric acid (pH <2), and extracted with ethyl acetate. The combined organic layers were dried over sodium sulfate and concentrated to afford (S)-2-[4-(2,6-difluoro-3-methoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid, (0.212 g, 87%), as a light brown solid.

Workup

customthe solvents evaporated
dissolutionThe residue was dissolved in water
washwashed with diethyl ether
extractionextracted with ethyl acetate
dry with materialThe combined organic layers were dried over sodium sulfate
concentrationconcentrated

Sources & evidence

ORD record: ord-c90734b29b9348d6a6a52cb092345f44
Source dataset: uspto-grants-2010_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07741327B2

Reaction notes

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