反应详情

To a solution of methyl 4-amino-3-fluoro-5,6′-dimethoxy-[2,3′-bipyridine]-6-carboxylate (100 mg, 0.325 mmol) in THF (1.0 mL), MeOH (1.000 mL), and Water (0.500 mL), lithium hydroxide hydrate (60 mg, 1.430 mmol) was added as a solid. The solution was stirred at room temperature for 18 hrs. The reaction solution was then concentrated under vacuum to dryness. The resulting solid was suspended in H2O and the pH was adjusted to 3.8, forming a ppt. The suspension was extracted with EtOAc (3×25 mL). The combined organic layers were dried over MgSO4, filtered and concentrated under vacuum to yield 4-amino-3-fluoro-5,6′-dimethoxy-[2,3′-bipyridine]-6-carboxylic acid (80.1 mg, 0.273 mmol, 84% yield).). ESIMS for m/z 294 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ 3.78 (s, 3H), 3.92 (s, 3H), 6.47 (s, 2H), 6.95 (dd, J=8.7, 0.8 Hz, 1H), 8.15 (ddd, J=8.7, 2.4, 1.1 Hz, 1H), 8.61 (t, J=2.1 Hz, 1H), 13.02 (s, 1H). 19F NMR (376 MHz, DMSO-d6) δ −141.78.

1. concentrationThe reaction solution was then concentrated under vacuum to dryness
2. customforming a ppt
3. extractionThe suspension was extracted with EtOAc (3×25 mL)
4. dry with materialThe combined organic layers were dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under vacuum