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

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.

1. customresulting
2. customreaction mixture
3. extractionthe aqueous mixture was extracted with EtOAc
4. washwashed with water, brine
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated onto silica gel

ORD-Eintrag

ord-92072bde9ea74ea099c5208bfacfbdc3

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09434719B2