反应详情

The obtained 2-fluoro-5-hydroxybenzoic acid (3e) (780 mg, 5 mmol) was dissolved in 100 mL methanol. Thionyl chloride (0.8 mL, 10 mmol) was added dropwise under the condition of ice bath (0° C.) and stirring, and then refluxed for two hours. The reaction solution was concentrated, and then column chromatography (petroleum ether:ethyl acetate=2:1) was performed to isolate methyl 2-fluoro-5-hydroxybenzoate (3f), 833 mg white solid (yield 98%). 1H NMR (600 MHz, DMSO-d6) δ 9.73 (s, 1H), 7.20-7.18 (m, 1H), 7.13-7.09 (m, 1H), 6.99-6.97 (m, 1H), 3.80 (s, 3H); ESI-MS m/z: calculated for 170.04. found 171.25 [M+H]+.

1. temperaturerefluxed for two hours
2. concentrationThe reaction solution was concentrated