Chloroacetyl chloride → 4-(4-Methoxy-benzyl)-6-methyl-[1,4]oxazepan-3-one

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Reaction Conditions

Reaction Steps

To a solution of 3-(4-methoxy-benzylamino)-2-methyl-propan-1-ol (4.14 g, 19.8 mmol) in dichloromethane (60 ml) was added triethylamine (2.20 g, 21.8 mmol) and chloroacetyl chloride (2.46 g, 21.8 mmol) at 0° C. The mixture was stirred at 0° C. for one hour and partitioned between 0.5N—HCl and dichloromethane. The organic layer was washed with brine, dried over sodium sulfate and concentrated in vacuo. The residue was dissolved into 2-propanol (66.7 ml), then potassium hydroxide (2.22 g, 39.6 mmol) was added at 0° C. The mixture was stirred for 16 hours and partitioned between saturated ammonium chloride aqueous solution and ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate and concentrated in vacuo. The residue was purified by silica gel column chromatography (eluant: hexane/ethyl acetate=1/1 to 1/3) to afford 4-(4-methoxy-benzyl)-6-methyl-[1,4]oxazepan-3-one as white solid (4.35 g, 88%).

Provenance & Evidence