p-Toluenesulfonic acid → HCID 16659479, compound

Participants

Reaction Steps

This compound was prepared according to General Method 19 (EXAMPLE 45) from (2R)-2-(2-fluoro-4-nitrophenyl)amino-1-butanol (1.6 g, 70 mmol), trifluoroacetaldehyde ethyl hemiacetal (4.9 g, 34 mmol) and p-toluenesulfonic acid (0.13 g, 0.68 mmol) in 70 mL anhydrous benzene to afford 1.8 g (85%) of (4R)-3-(2-fluoro-4-nitrophenyl)-4-ethyl-2-trifluoromethyloxazolidine, after flash chromatography (gradient elution, hexanes:ethyl acetate 90:10 to 50:50). Data for (4R)-3-(2-fluoro-4-nitrophenyl)-4-ethyl-2-trifluoromethyloxazolidine: 1H NMR (500 MHz, CDCl3) δ 8.01 (m, 1H), 7.98 (m, 1H), 6.95 (dd, J=8.8, 8.8, 1H), 5.68 (m, 1H), 4.30 (m, 1H), 4.08 (m, 1H), 3.92 (m, 1H), 2.00 (m, 1H), 1.67 (m, 1H), 0.97 (t, J=7.8, 3H).

Provenance & Evidence