Triethylamine → (R)-3-(2,5-difluoropyrimidin-4-yl)-4-((R)-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-((S)-1-hydroxyethyl)oxazolidin-2-one (0.47 g, 1.917 mmol) in THF (6.4 mL) was added perfluorobutanesulfonyl fluoride (1.03 mL, 5.75 mmol) followed by the addition of triethylamine trihydrofluoride (0.94 mL, 5.75 mmol) and triethylamine (2.40 mL, 17.3 mmol) resulting reaction mixture allowed to stir at room temperature for 6 hr. The reaction mixture was diluted with water and the aqueous mixture was extracted with EtOAc. Organic phases combined, washed with water, brine, dried (Na2SO4), filtered and concentrated onto silica gel. Silica gel column chromatography (EtOAc/Heptane 0 to 60%) provided a white crystalline of (R)-3-(2,5-difluoropyrimidin-4-yl)-4-((R)-1-fluoroethyl)oxazolidin-2-one (150 mg, 0.61 mmol, 32% yield). 1H NMR (400 MHz, CDCl3) δ 1.37 (dd, J=24.26, 6.26 Hz, 3H) 4.48 (dd, J=9.39, 4.70 Hz, 1H) 4.63 (t, J=8.80 Hz, 1H) 4.90-5.02 (m, 1H) 5.02-5.25 (m, 1H) 8.50 (s, 1H). LCMS m/z 248.0 (M+H)+, Rt 0.59 min.

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