Ethyl Acetate → (S)-N-((3-Fluoro-4-(trifluoromethoxy)phenyl)(3-fluoropyridin-2-yl)methyl)-2-oxo-1,2-dihydrooxazolo[5,4-c]pyridine-6-carboxamide

Participants

Reaction Conditions

Reaction Steps

To a cooled (−78° C.) stirred mixture of (S)-4-amino-N-((3-fluoro-4-(trifluoromethoxy)phenyl)(3-fluoropyridin-2-yl)methyl)-5-hydroxypicolinamide (200 mg, 0.00045 mol) in THF (5 mL) were added TEA (0.31 mL, 0.002 mol, Spectrochem, India) and triphosgene (270 mg, 0.0009 mol, Spectrochem, India) in one lot and the reaction mixture was stirred for 2 h at the same temperature, warmed to rt and stirred for 12 h. 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 organic layers were combined and dried over anhydrous sodium sulfate and concentrated. The product thus obtained was purified by column chromatography, silica gel (60-120 mesh) using 50-60% EtOAc in petroleum ether as the eluent, and further purified using Prep TLC plates, mobile phase 50% EtOAc in hexanes to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ ppm 9.76 (d, J=7.6 Hz, 1H), 8.60 (s, 1H), 8.58 (d, J=4.8 Hz, 1H), 7.82 (t, J=8.8 Hz, 1H), 7.70 (s, 1H), 7.56-7.50 (m, 3H), 7.34 (d, J=8.4 Hz, 1H), 6.53 (d, J=6.8 Hz, 1H). MS (ESI, positive ion) m/z: 468.0 (M+H).

Provenance & Evidence