N-Iodosuccinimide → Compound 3

Participants

Reaction Conditions

Reaction Steps

A solution of (5R)-(3-(3-fluoro-phenyl)-5-hydroxymethyl-oxazolidin-2-one (1018, 10.74 g, 50.9 mmol) in trifluoroacetic acid (TFA, 50 mL) was treated with N-iodosuccinimide (NIS, 12.03 g, 53.45 mmol, 1.05 equiv) at 25° C., and the resulting reaction mixture was stirred at 25° C. for 2 h. When TLC and HPLC/MS showed that the reaction was complete, the reaction mixture was concentrated in vacuo. The residue was then treated with H2O (100 mL) and 20% EtOAc-hexane (100 mL) at 25° C., and the resulting mixture was stirred at 25° C. for 30 min before being cooled down to 0-5° C. for 2 h. The white solids were collected by filtration, washed with H2O (2×25 mL) and 20% EtOAc-hexane (2×25 mL), and dried in vacuo to afford the crude, desired (5R)-3-(3-fluoro-4-iodo-phenyl)-5-hydroxymethyl-oxazolidin-2-one (1019, 15.1 g, 17.15 g theoretical, 88%) as off-white powders, which were found to be essentially pure and was directly used in the subsequent reactions without further purifications. For 1019: 1H NMR (300 MHz, DMSO-d6) δ 3.58 (dd, 1H, J=4.2, 12.6 Hz), 3.67 (dd, 1H, J=3.0, 12.6 Hz), 3.67 (dd, 1H, J=6.3, 9.0 Hz), 4.07 (t, 1H, J=9.0 Hz), 4.72 (m, 1H), 5.21 (br. s, 1H, OH), 7.22 (dd, 1H, J=2.4, 8.4 Hz), 7.58 (dd, 1H, J=2.4, 11.1 Hz), 7.81 (dd, 1H, J=7.8, 8.7 Hz); C10H9FINO3, LCMS (EI) m/e 338 (M++H).

Provenance & Evidence