Sodium hydride → HCID 59657472, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 5.0 g 4-butyl-2-oxo-1-oxa-3,8-diaza-spiro[4.5]decane-8-carboxylic acid benzyl ester (14.4 mmol) in 50 mL DMF was added 994 mg of sodium hydride (21.6 mmol, 60% dispersion in mineral oil). The reaction mixture stirred for five minutes and 2.2 mL of cyclohexylmethyl bromide (15.8 mmol) was then added. The reaction mixture stirred under nitrogen for 18 h. The reaction mixture was heated to 70° C. for three h. The reaction mixture cooled to room temperature and was diluted with 500 mL EtOAc and washed twice with water, once with brine. The organics were dried over magnesium sulfate and evaporated under reduced pressure. The residue was purified by flash chromatography on silica gel utilizing a gradient elution (10% to 15% EtOAc/DCM) to provide 4.1 g (65%) of 4-butyl-3-cyclohexylmethyl-2-oxo-1-oxa-3,8-diaza-spiro[4.5]decane-8-carboxylic acid benzyl ester: ms [M]+=443.

Provenance & Evidence