反应详情

温度

0 °C

A solution of (S)-(-)-4-[4-[5-[(acetylamino)methyl]-2-oxo-3-oxazolidinyl]-2-fluorophenyl]-3,6-dihydro-1(2H)-pyridinecarboxylic acid 1,1-dimethylethyl ester (EXAMPLE 38, Step 1, 1.00g) in dry methylene chloride (9.2 mL) at 0° C. under N2 is treated with trifluoroacetic acid (2.3 mL) over one minute, and the resulting mixture is stirred at 0° C. for three hours and added slowly to saturated aqueous potassium carbonate (30 mL) to neutralize excess trifluoroacetic acid. The resultant slurry is filtered and the precipitate is chromatographed on silica gel (70-230 mesh, 60 g), eluting with ammonium hydroxide/methanol/methylene chloride (0.25/19.75/80). Those fractions with an Rf =0.08 by TLC (methanol/chloroform, 20/80) are pooled and concentrated under reduced pressure to give the title compound, 1H NMR (MeOH-d4, 400 MHz) 7.47, 7.33, 7.25, 6.02, 4.80, 4.15, 3.83, 3.58, 3.47, 3.04, 2.46, 1.98 δ.

1. filtrationThe resultant slurry is filtered
2. customthe precipitate is chromatographed on silica gel (70-230 mesh, 60 g)
3. washeluting with ammonium hydroxide/methanol/methylene chloride (0.25/19.75/80)
4. concentrationconcentrated under reduced pressure