反应详情

A mixture of methyl 3-(bromomethyl)-2-fluorobenzoate (11.5 g, 46.4 mmol) from Step B above and solid sodium bicarbonate (33.0 g, 398.7 mmol) in DMSO (150 mL) was refluxed until the reaction was complete by TLC (2-3 h). The mixture was cooled in an ice bath immediately and then partitioned between brine and ethyl acetate. The combined organics were concentrated and purified by column chromatography (silica gel, 9:1 hexanes/ethyl acetate) to afford methyl 2-fluoro-3-formylbenzoate as a white solid (5.44 g, 64%): 1H NMR (300 MHz, CDCl3) δ 10.43 (s, 1H), 8.21 (t, J=7.8 Hz, 1H), 8.07 (t, J=6.0 Hz, 1H), 7.35 (t, J=7.8 Hz, 1H), 3.93 (s, 3H).

1. temperaturewas refluxed until the reaction
2. customwas complete by TLC (2-3 h)
3. temperatureThe mixture was cooled in an ice bath immediately
4. custompartitioned between brine and ethyl acetate
5. concentrationThe combined organics were concentrated
6. custompurified by column chromatography (silica gel, 9:1 hexanes/ethyl acetate)