反应详情

温度

20 °C

To a solution containing (S)-4-methyl-2-(2-oxo-4-o-tolyloxy-2,5-dihydro-pyrrol-1-yl)-pentanoic acid methyl ester (1.50 g, 4.7 mmol) in tetrahydrofuran (30 mL) was treated with an aqueous solution of lithium hydroxide monohydrate (0.5N, 20 mL, 10.0 mmol). The mixture was stirred at 20° 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)-4-methyl-2-(2-oxo-4-o-tolyloxy-2,5-dihydro-pyrrol-1-yl)-pentanoic acid (1.30 g, 91%) as a tan solid.

1. customthe solvents evaporated
2. dissolutionThe residue was dissolved in water
3. washwashed with diethyl ether
4. extractionextracted with ethyl acetate
5. dry with materialThe combined organic layers were dried over sodium sulfate
6. concentrationconcentrated