Oxalyl chloride → (4S)-4-(1-Methylethyl)-3-(5,5,5-trifluoro-1-oxopentyl)-2-oxazolidinone

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 5,5,5-trifluoropentanoic acid (5.04 g, 32.3 mmol) in DCM (50 mL) and DMF (3 drops) was added oxalyl chloride (3.4 mL, 38.8 mmol) dropwise over 5 min. The solution was stirred until all bubbling subsided. The reaction mixture was concentrated under reduced pressure to give a pale yellow oil. To a separate flask, charged with a solution of (4S)-4-(propan-2-yl)-1,3-oxazolidin-2-one (4.18 g, 32.4 mmol) in THF (100 mL) at −78° C. was added n-BuLi (13.0 mL, 32.5 mmol, 2.5M in hexane) dropwise via syringe over 5 min. After stirring for 10 min, the above acid chloride, dissolved in THF (20 mL), was added via cannula over 15 min. The reaction mixture was warmed to 0° C. and was allowed to warm to room temperature as the bath warmed and stirred overnight. To the reaction mixture was then added saturated NH4Cl, and it was then extracted with EtOAc (2×). The combined organics were washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude material was purified by silica gel chromatography (hexanes/EtOAc) to provide Intermediate S-1G (7.39 g, 86%) as a colorless oil: 1H NMR (400 MHz, CDCl3) δ 4.44 (1H, dt, J=8.31, 3.53 Hz), 4.30 (1H, t, J=8.69 Hz), 4.23 (1H, dd, J=9.06, 3.02 Hz), 2.98-3.08 (2H, m), 2.32-2.44 (1H, m, J=13.91, 7.02, 7.02, 4.03 Hz), 2.13-2.25 (2H, m), 1.88-2.00 (2H, m), 0.93 (3H, d, J=7.05 Hz), 0.88 (3H, d, J=6.80 Hz).

Provenance & Evidence