(6R)-6-methylmorpholin-3-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To sodium hydride (63%, 4.4 g, 116 mmol) suspended in tetrahydrofuran (100 mL), a solution of (6R)-6-methylmorpholin-3-one (EP350002) (12.1 g) in tetrahydrofuran (50 mL) was added dropwise over 30 minutes under ice cooling. The mixture was stirred at the same temperature for 30 minutes and then further stirred at room temperature for 30 minutes. A solution of chloromethyl methyl ether (10 mL) in tetrahydrofuran (50 mL) was added dropwise thereto over 30 minutes under ice cooling. The mixture was stirred for 30 minutes under ice cooling and then stirred overnight at room temperature. An appropriate amount of water for partition was added thereto, followed by several extractions with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and the obtained residue was purified by silica gel column chromatography (eluting solvent: hexane-hexane/ethyl acetate=40/60) to obtain the title compound (7.86 g). further stirred at room temperature for 30 minutes over 30 minutes under ice cooling The mixture was stirred for 30 minutes under ice cooling stirred overnight at room temperature An appropriate amount of water for partition was added followed by several extractions with ethyl acetate The organic layer was dried over anhydrous sodium sulfate The solvent was distilled off under reduced pressure the obtained residue was purified by silica gel column chromatography (eluting solvent: hexane-hexane/ethyl acetate=40/60)