反应详情

4-Chloro-3-fluoro-benzaldehyde (5.14 g, 32.4 mmol) was dissolved in THF (100 mL) and place at −78° C. under nitrogen atmosphere. Methyl Lithium (1.6 M in diethyl ether, 22.3 mL) was added to the reaction during a period of 3 minutes maintianing the same temperature. After the addition, the reaction was stirred at room temperature for 1 h. Then, the reaction was poured over ice water and extracted with ethyl acetate and hydrochloric acid 1N. The organic layer was collected, dried with sodium sulfate, filtered and concentrated under vacuum to produce a crude, which it was chromatograph over silica gel using 50% hexane-ethyl Acetate as solvent to yield 5.1 g of 1-(4-chloro-3-fluoro-phenyl)-ethanol. 1H NMR (400 MHz, Cl3CD) δ 7.37 (t, J=8.14 Hz, 1H), 7.20 (dd, J=1.86, 10.00 Hz, 1H), 7.09 (dd, J=1.86, 8.14 Hz, 1H), 4.89 (m, 1H), 1.93 (br s, 1H), 1.49 (d, J=6.51, 3H).

1. customat −78° C.
2. additionAfter the addition
3. extractionextracted with ethyl acetate and hydrochloric acid 1N
4. customThe organic layer was collected
5. dry with materialdried with sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated under vacuum
8. customto produce a crude, which it