反应详情

温度

5 °C

A solution of (S)-2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-hexanoic acid ethyl ester (0.95 g, 2.60 mmol) in tetrahydrofuran (15 mL) was treated with an aqueous 0.5N lithium hydroxide solution (10.4 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 extracted with diethyl ether. The ether layer was discarded, and the aqueous layer was acidified with 1N aqueous hydrochloric acid (8 mL) and extracted with ethyl acetate. The combined ethyl acetate layers were concentrated in vacuo which afforded (S)-2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-hexanoic acid (839 mg, 96%) as a pale orange solid.

1. concentrationThe mixture was concentrated in vacuo
2. dissolutionthe residue was dissolved in water (40 mL)
3. extractionextracted with diethyl ether
4. extractionextracted with ethyl acetate
5. concentrationThe combined ethyl acetate layers were concentrated in vacuo which