Triethylamine → (R)-4-((S)-1-fluoroethyl)-3-(4-methoxybenzyl)oxazolidin-2-one

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To a cooled (0° C.) solution of (R)-4-((R)-1-hydroxyethyl)-3-(4-methoxybenzyl)oxazolidin-2-one (2.27 g, 9.04 mmol) in 30 mL MeCN were added triethylamine (11.4 mL, 82 mmol) followed by perfluoro-1-butanesulfonyl fluoride (4.9 mL, 27.3 mmol) and NEt3(HF)3 (4.5 mL, 27.6 mmol) and the resulting mixture was stirred at 0° C. for 70 min. The reaction mixture was diluted with water (60 mL) and extracted with EtOAc (3×60 mL). Combined organics were washed with water (70 mL), brine (70 mL), dried over Na2SO4, filtered and concentrated. Flash column chromatography (EtOAc/heptane 5 to 70%) gave 2.19 g of the desired product. 1H NMR (400 MHz, CDCl3) δ 7.25-7.20 (m, 2H), 6.92-6.83 (m, 2H), 4.87 (d, J=15.1 Hz, 1H), 4.75 (dqd, J=47.6, 6.6, 2.1 Hz, 1H), 4.26 (td, J=9.2, 1.4 Hz, 1H), 4.17-4.05 (m, 2H), 3.81 (s, 3H), 3.71 (dddd, J=19.8, 9.5, 5.8, 2.1 Hz, 1H), 1.29 (dd, J=23.1, 6.2 Hz, 3H). MS m/z 254.5 (M+H).

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