HCID 54347376, compound → HCID 69766454, compound

Participants

Reaction Steps

A mixture of (R)-(−)-4-[4-[5-(azidomethyl)-2-oxo-3-oxazolidinyl]-2,6-difluorophenyl]-1-piperidinecarboxylic acid 1,1-dimethylethyl ester ((EXAMPLE 35, Step 6, 1.51 g) and 10% palladium on carbon (367 mg) in methanol (35 mL) is stirred under a hydrogen atmosphere (balloon) for 18 hours, the catalyst is removed by filtration through Celite and the filtrate is concentrated under reduced pressure to give the 5-aminomethyl-2-oxazolidinone intermediate (Rf=0.10 by TLC, methanol/chloroform, 5/95). A solution of this intermediate (1.28 g) and pyridine (2.51 mL) in dry methylene chloride (31 mL) at 0° C. under N2 is treated with acetic anhydride (1.47 mL), and the resulting solution is allowed to warm to ambient temperature with stirring over 1.5 hours. The mixture is then diluted with methylene chloride (15 mL), washed with water (10 mL), saturated aqueous sodium bicarbonate (2×10 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 (70-230 mesh, 150 g), eluting with a gradient of methanol/methylene chloride (1/99-4/96). Pooling and concentration of those fractions with an Rf=0.31 by TLC (methanol/chloroform, 5/95), trituration with diethyl ether and filtration gives the title compound, NMR (CDCl13, 400 MHz) 7.06, 6.56, 4.78, 4.22, 4.00, 3.74, 3.65, 3.05, 2.75, 2.02, 1.96, 1.64, 1.47δ.

Provenance & Evidence