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

Participants

Reaction Steps

To a solution of (S)-6-amino-N-((3-fluoro-4-(trifluoromethoxy)phenyl)(3-fluoropyridin-2-yl)methyl)-5-hydroxypicolinamide (300 mg, 0.681 mmol) in THF (10 mL) was added TEA (689.4 mg, 0.00068 mmol, S.d fine, India) and triphosgene (242 mg, 0.0008 mmol, Sigma Aldrich, India) at 0° C. The reaction mixture was stirred for 2 h at room temperature. After completion of the reaction, monitored by TLC (TLC eluent: 50% EtOAc in petroleum ether), the reaction mixture was quenched with sat'd NaHCO3 solution and extracted with EtOAc (3×20 mL). The combined organic layers were washed with brine, dried over anhydrous sodium sulfate, concentrated and purified by silica gel (60-120 mesh) column chromatography eluting with 80-100% EtOAc in petroleum ether to afford the title compound as an off white solid. 1H-NMR (400 MHz, DMSO-d6): δ 12.8 (br. s., 1H), 9.46 (d, J=7.2 Hz, 1H), 8.55 (d, J=4.4 Hz, 1H), 7.83-7.77 (m, 3H), 7.57-7.49 (m, 3H), 7.33 (d, J=8.4 Hz, 1H), 6.55 (d, J=6.8 Hz, 1H). MS (ESI, positive ion) m/z: 467.2 (M+H).

Provenance & Evidence