反应详情

A solution of (R)-4-((S)-1-fluoroethyl)-3-(4-methoxybenzyl)oxazolidin-2-one (1.98 g 7.8 mmol) in 40 mL TFA was heated at 65° C. for 16 h. The reaction mixture was concentrated to remove TFA. Flash column chromatography (EtOAc/CH2Cl2, 0 to 100%) gave 0.91 g (R)-4-((S)-1-fluoroethyl)-oxazolidin-2-one as a pale brown solid. TLC (1:2 heptane:EtOAc) Rf=0.25. 1H NMR (400 MHz, CDCl3) δ 5.60 (br s, 1H), 4.72-4.54 (m, 1H), 4.51 (td, J=8.9, 0.9 Hz, 1H), 4.32 (dd, J=9.2, 4.8 Hz, 1H), 4.02-3.88 (m, 1H), 1.38 (dd, J=24.0, 6.3 Hz, 3H).

1. concentrationThe reaction mixture was concentrated
2. customto remove TFA