Triethylamine → (R)-3-(2,5-difluoropyrimidin-4-yl)-4-((S)-1-fluoroethyl)oxazolidin-2-one

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To a round bottom flask containing a solution of (R)-3-(2,5-difluoropyrimidin-4-yl)-4-((R)-1-hydroxyethyl)oxazolidin-2-one (4.64 g, 18.9 mmol) in Acetonitrile (63 mL) cooled to 0° C. was added perfluorobutanesulfonyl fluoride (10.2 mL, 56.8 mmol) followed by the addition of triethylamine trihydrofluoride (9.2 mL, 56.8 mmol) and triethylamine (23.7 mL, 170 mmol). The resulting reaction mixture allowed to stir at 0° C. for 4 hr. The reaction mixture was then diluted with water and the aqueous mixture was extracted with EtOAc. The organic phases combined, washed with water, brine, dried (Na2SO4), filtered and concentrated onto silica gel. Silica gel column chromatography (EtOAc/Heptane 0 to 100%) provided a white crystalline of (R)-3-(2,5-difluoropyrimidin-4-yl)-4-((S)-1-fluoroethyl)oxazolidin-2-one (2.24 g, 8.97 mmol, 47% yield). 1H NMR (400 MHz, CDCl3) 8.50 (s, 1H), 5.00-5.25 (m, 1H), 4.75-4.92 (m, 1H), 4.54-4.68 (m, 2H), 1.39 (dd, J=23.1, 7.0 Hz, 3H). LCMS m/z 248.0 (M+H)+, Rt 0.52 min.

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