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0 °C

A mixture of (S)-(−)-N-[[2-oxo-3-[4-(4-piperidinyl)phenyl]-5-oxazolidinyl]methyl]acetamide (EXAMPLE 17, 300 mg) and triethylamine (0.20 mL) in dry methylene chloride (19 mL) at 0° C. under N2 is treated with benzyloxyacetyl chloride (0.18 mL), and the resulting solution is stirred at 0° C. for one hour and at ambient temperature for one hour. The reaction mixture is then washed with water (2×10 mL), saturated aqueous sodium bicarbonate (10 mL) and saline (10 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the crude product which is chromatographed on silica gel (230-400 mesh, 45 g), eluting with a gradient of methanol/methylene chloride (11/99-2/98). Pooling and concentration of those fractions with an Rf=0.28 by TLC (methanol/chloroform, 5/95) gives the title compound, NMR (CDCl3, 400 MHz) 7.45, 7.35, 7.18, 6.26, 4.75, 4.63, 4.22, 4.04, 3.78, 3.70, 3.60, 3.09, 2.70, 2.02, 1.85, 1.60δ.

1. washThe reaction mixture is then washed with water (2×10 mL), saturated aqueous sodium bicarbonate (10 mL) and saline (10 mL)
2. dry with materialdried over anhydrous sodium sulfate
3. concentrationconcentrated under reduced pressure
4. customto give the crude product which
5. customis chromatographed on silica gel (230-400 mesh, 45 g)
6. washeluting with a gradient of methanol/methylene chloride (11/99-2/98)