反应详情

温度

-78 °C

To a cooled (−78° C.) and stirred mixture of ((S)-5-amino-N-((3-fluoro-4-(trifluoromethoxy)phenyl)(3-fluoropyridin-2-yl)methyl)-4-hydroxypicolinamide (200 mg, 0.00045 mol) in THF (5 mL) was added TEA (0.31 mL, 0.002 mol, Spectrochem, India) and triphosgene (270 mg, 0.0009 mol, Spectrochem, India). The reaction mixture was stirred for 2 h at same temperature, slowly warmed to rt and stirred overnight. After completion of the reaction (monitored by TLC, 50% EtOAc in hexane), the reaction mixture was quenched with sat'd NaHCO3 (5 mL), extracted with EtOAc (10 mL×3). The combined organic layers were dried over anhydrous sodium sulfate, concentrated and purified by column chromatography, silica gel (60-120 mesh) using 50-60% EtOAc in petroleum ether as the eluent, followed by further purification using Prep TLC plates, mobile phase 50% EtOAc in hexanes to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ ppm 9.79 (d, J=7.2 Hz, 1H), 9.00 (s, 1H), 8.53 (d, J=4.4 Hz, 1H), 8.41 (s, 1H), 8.08 (s, 1H), 7.44-7.35 (m, 1H), 7.35-7.31 (m, 3H), 7.26-7.21 (m, 1H), 6.64 (d, J=7.6 Hz, 1H). MS (ESI, positive ion) m/z: 467.2 (M+H).

1. stirringThe reaction mixture was stirred for 2 h at same temperature
2. temperatureslowly warmed to rt
3. stirringstirred overnight
4. customthe reaction mixture was quenched with sat'd NaHCO3 (5 mL)
5. extractionextracted with EtOAc (10 mL×3)
6. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
7. concentrationconcentrated
8. custompurified by column chromatography, silica gel (60-120 mesh)
9. customfollowed by further purification