反应详情

To a stirred solution of 5-fluoro-2-(4-fluorophenoxy)nicotinic acid (step 2, 300 mg, 1.2 mmol) and methyl 4-(aminomethyl)benzoate hydrochloride (284 mg, 1.4 mmol) in dichloromethane (10 mL) were successively added 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI) (670 mg, 3.5 mmol), 1-hydroxybenzotriazole hydrate (HOBT) (368 mg, 2.4 mmol), and triethylamine (3 mL). After being stirred overnight, the reaction was quenched by the addition of saturated sodium bicarbonate aqueous solution (50 mL). The aqueous layer was extracted with dichloromethane (50 mL×2) and the combined organic layers were washed with brine (50 mL), dried (sodium sulfate), and evaporated. The remaining residue was purified by flush column chromatography on silica gel (50 g) eluting with hexane/ethyl acetate (3/1) to afford 407 mg (85%) of the title compounds as white solids: 1H-NMR (CDCl3) δ 8.39 (1H, dd, J=8.3, 3.1 Hz), 8.28 (1H, br.s), 8.05 (1H, d, J=3.1 Hz), 8.01 (2H, d, J=8.1 Hz), 7.42 (2H, d, J=8.1 Hz), 7.17–7.05 (4H, m), 4.76 (2H, d, J=5.9 Hz), 3.91 (3H, s); MS (ESI) m/z 399 (M+H)+, 397 (M−H)−.

1. customthe reaction was quenched by the addition of saturated sodium bicarbonate aqueous solution (50 mL)
2. extractionThe aqueous layer was extracted with dichloromethane (50 mL×2)
3. washthe combined organic layers were washed with brine (50 mL)
4. dry with materialdried (sodium sulfate)
5. customevaporated
6. customThe remaining residue was purified
7. customby flush column chromatography on silica gel (50 g)
8. washeluting with hexane/ethyl acetate (3/1)