反应详情

A solution of (S)-(-)-N-[[3-[4-vinyl-3-fluorophenyl]-2-oxo-5-oxazolidinyl]methyl]acetamide (EXAMPLE 41, Step 1, 3.50 g) and trifluoroacetic acid (0.23 mL) in dry methylene chloride under N2 is treated with a solution of N-benzyl-N-(methoxymethyl) trimethylsilylmethylamine (6.10 g) in dry methylene chloride (50 mL) dropwise over 4.5 hours, and the resulting solution was stirred at ambient temperature for 17 hours. The reaction mixture is then washed with saturated aqueous sodium bicarbonate (30 mL), water (30 mL) and saline (30 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure to give a residue which is chromatographed on silica gel (230-400 mesh, 350 g), eluting with a gradient of methanol/methylene chloride (1/99-10/90). Pooling and concentration of those fractions with an Rf =0.19 by TLC (methanol/chloroform, 10/90) and trituration with methanol/diethyl ether gives the title compound, NMR (CDCl3, 400 MHz) 7.35, 7.25, 7.13, 6.08, 4.78, 4.03, 3.76, 3.69, 3.62, 2.97, 2.78, 2.56, 2.33, 2.02, 1.85 δ.

1. washThe reaction mixture is then washed with saturated aqueous sodium bicarbonate (30 mL), water (30 mL) and saline (30 mL)
2. dry with materialdried over anhydrous sodium sulfate
3. concentrationconcentrated under reduced pressure
4. customto give a residue which
5. customis chromatographed on silica gel (230-400 mesh, 350 g)
6. washeluting with a gradient of methanol/methylene chloride (1/99-10/90)