Lithium Hydroxide → (R)-2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-hexanoic acid

Participants

Reaction Conditions

Reaction Steps

A solution of (R)-2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-hexanoic acid ethyl ester (1.25 g, 3.42 mmol) in tetrahydrofuran (14 mL) was treated with a 0.5N lithium hydroxide solution (4 mL) and stirred at 5° C. for 2 h. The mixture was concentrated in vacuo and the residue was dissolved in water (40 mL) and washed with diethyl ether. The organic phase was discarded and the aqueous layer acidified with 1N aqueous hydrochloric acid (10 mL) and extracted with ethyl acetate. The combined ethyl acetate layers were concentrated in vacuo which afforded (R)-2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-hexanoic acid (1.13 g, 98%) as a pale brown solid.

Provenance & Evidence