反应详情

温度

-40 °C

To a solution of ethyl 4-iodobenzoate (1.45 mL, 8.69 mmol) in anhydrous tetrahydrofuran (14.5 mL) at −40° C. was added isopropyl magnesium chloride lithium chloride complex (8.0 mL, 10.4 mmol) dropwise. The resulting brown solution was stirred for 40 min at −40° C. The crude cyclobutanecarbaldehyde (1.8 g, approximately 10.5 mmol pure) was added and the reaction was warmed to room temperature and stirred for 18 h. The reaction is then quenched with 1 N hydrochloric acid and extracted three times with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered, and concentrated to give 2.0 g of crude material. Purification by silica gel flash chromatography (0-20% ethyl acetate in heptane) afforded ethyl 4-(cyclobutyl(hydroxy)methyl)benzoate (1.05 g) as an oil. 1H NMR (400 MHz, CDCl3) δ 8.01 (d, J=8.4 Hz, 2H), 7.39 (d, J=8.2 Hz, 2H), 4.64 (d, J=7.6 Hz, 1H), 4.47-4.25 (m, 2H), 2.73-2.47 (m, 1H), 2.13-1.94 (m, 2H), 1.95-1.70 (m, 4H), 1.55 (br. s., 1H), 1.38 (t, J=7.0 Hz, 3H).

1. temperaturethe reaction was warmed to room temperature
2. stirringstirred for 18 h
3. customThe reaction is then quenched with 1 N hydrochloric acid
4. extractionextracted three times with ethyl acetate
5. dry with materialThe combined organic layers were dried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customto give 2.0 g of crude material
9. customPurification by silica gel flash chromatography (0-20% ethyl acetate in heptane)