O-Methylhydroxylamine hydrochloride → HCID 9881022, compound

Participants

Reaction Steps

A mixture of (5R)-(−)-3-[3-fluoro-4-(4-morpholinyl)phenyl]-2-oxo-5-oxazolidinecarboxylic acid (EXAMPLE 1, Step 1, 150 mg, 0.483 mmol) and O-methylhydroxylamine hydrochloride (61 mg, 0.724 mmol) in tetrahydrofuran/water (1/1, 4.8 mL) is treated with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (278 mg, 1.45 mmol), and the resulting mixture is stirred at ambient temperature for 30 minutes and is then diluted with water (10 mL) and extracted with ethyl acetate (2×20 mL). The combined organic phase is washed with water (10 mL) and saline (10 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure, and the crude product is chromatographed on a Flash 40S silica gel (40 g, 32–63 μm) cartridge, eluting with methanol/methylene chloride (2.5/97.5). Pooling and concentration of those fractions with an Rf=0.53 by TLC (methanol/chloroform, 10/90) gives the title compound, mp 206–208° C. (decomp.); MS (ESI+) for C51H18FN3O5 m/z 340 (M+H)+; [α]25D=−56° (c 0.92, DMSO).

Provenance & Evidence