反应详情

Ethyl 7-((3-fluorobenzyl)oxy)-1,5-naphthyridine-3-carboxylate. To a solution of ethyl 7-hydroxy-1,5-naphthyridine-3-carboxylate (Intermediate 4, 1.0 g, 4.59 mmol) in DMF (20 mL) was added Cs2CO3 (2.2 g, 6.75 mmol), followed by 3-fluorobenzyl chloride (0.6 mL, 5.02 mmol). The reaction was stirred at ambient temperature for 72 h. The crude reaction mixture was poured into EtOAc and water. The aqueous later was extracted with EtOAc and the combined organic fractions were washed with brine and concentrated under reduced pressure onto silica. Purification (FCC, SiO2, 0-60%, EtOAc/hexanes) afforded the title compound as a white solid (1.0 g, 69%). 1H NMR (400 MHz, CDCl3) δ 9.44 (t, J=2.0 Hz, 1H), 9.00-8.94 (m, 1H), 8.88 (t, J=2.3 Hz, 1H), 7.74-7.65 (m, 1H), 7.47-7.33 (m, 1H), 7.28-7.26 (m, 1H), 7.21 (d, J=9.4 Hz, 1H), 7.07 (t, J=8.6 Hz, 1H), 5.25 (s, 2H), 4.59-4.38 (m, 2H), 1.52-1.41 (m, 3H). [M+H]=327.2.

1. customThe crude reaction mixture
2. extractionThe aqueous later was extracted with EtOAc
3. washthe combined organic fractions were washed with brine
4. concentrationconcentrated under reduced pressure onto silica
5. customPurification (FCC, SiO2, 0-60%, EtOAc/hexanes)