反应详情

To a flask containing ethyl 4-(cyclobutyl(hydroxy)methyl)benzoate (530 mg, 2.26 mmol) was added tetrahydrofuran (5.60 mL), water (5.60 mL), and methanol (5.60 mL). Lithium hydroxide monohydrate (475 mg, 11.3 mmol) was then added. The suspension was stirred at room temperature for 18 hours. The reaction was quenched with 1 N hydrochloric acid to pH 3 and extracted three times with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered, and concentrated to give 490 mg of crude material. Purification by silica gel flash chromatography (0-20% ethyl acetate in heptane) afforded 4-(cyclobutyl(hydroxy)methyl)benzoic acid (360 mg, 77%) as a white solid. 1H NMR (400 MHz, CDCl3) δ 8.07 (d, J=8.2 Hz, 2H), 7.43 (dd, J=8.0, 1.0 Hz, 2H), 4.67 (d, J=7.6 Hz, 1H), 2.62 (d, J=8.0 Hz, 1H), 2.09-1.98 (m, 2H), 1.91-1.80 (m, 4H). MS (M−1): 205.2.

1. customThe reaction was quenched with 1 N hydrochloric acid to pH 3
2. extractionextracted three times with ethyl acetate
3. dry with materialThe combined organic layers were dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customto give 490 mg of crude material
7. customPurification by silica gel flash chromatography (0-20% ethyl acetate in heptane)