反应详情

2′-Methoxy-5-(trifluoromethyl)-2,4′-bipyridine (337 mg, 1.32 mmol) was stirred in concentrated hydrochloric acid (200 mL) at 120° C. for 18 h and then concentrated. The residue was dissolved in MeOH (100 mL) and made basic with 6 N NaOH and re-concentrated until most of the solvent had been removed. The solids were filtered off, washed with water and dried under vacuum to provide the title compound (289 mg, 89%) as a white solid: 1H NMR (300 MHz, DMSO-d6) δ 11.08 (s, 1H) 9.10 (s, 1H), 8.36-8.33 (dd, J=8.4, 2.1 Hz, 1H), 8.25 (d, J=8.3 Hz, 1H), 7.53 (d, J=6.8, 1H), 7.09 (d, J=1.3 Hz, 1H), 6.90 (dd, J=6.8, 1.6 Hz, 1H).

1. concentrationconcentrated
2. dissolutionThe residue was dissolved in MeOH (100 mL)
3. concentrationre-concentrated until most of the solvent
4. customhad been removed
5. filtrationThe solids were filtered off
6. washwashed with water
7. customdried under vacuum