反应详情

温度

25 °C

A solution of 3-cyclopentyl-2-(4-nitro-phenyl)-propionic acid ethyl ester (14.1 g, 48.06 mmol) in tetrahydrofuran/water (300 mL, 3:1) was treated with lithium hydroxide (4.35 g, 103.67 mmol). The reaction was stirred at 25° C. for 21 h. The tetrahydrofuran was then removed in vacuo. The residue was diluted with water (75 mL) and extracted with ether (3×75 mL). The aqueous layer was acidified to pH=1 with a 3N aqueous hydrochloric acid solution. The product was extracted into methylene chloride (3×75 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (2×100 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo to give 3-cyclopentyl-2-(4-nitro-phenyl)-propionic acid (11.97 g, 93.6%) as a yellow solid: mp 119-125° C.; EI-HRMS m/e calcd for C14H17NO4 (M+) 263.1157, found 263.1162.

1. customThe tetrahydrofuran was then removed in vacuo
2. additionThe residue was diluted with water (75 mL)
3. extractionextracted with ether (3×75 mL)
4. extractionThe product was extracted into methylene chloride (3×75 mL)
5. washThe combined organic layers were washed with a saturated aqueous sodium chloride solution (2×100 mL)
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo