Water → HCID 66645676, compound

Participants

Reaction Steps

11.19 g of cesium carbonate (34.4 mmol) was added to a solution of 4.41 g of {2-[(2-bromoacetyl)phenylamino]-1,1-dimethylethyl}carbamic acid t-butyl ester obtained in the above reaction (11.5 mmol) in N,N-dimethylformamide (58 ml) under ice-cooling, and the mixture was stirred at room temperature for 18 hours. Water was added to the reaction mixture, followed by extraction with ethyl acetate. Then, the organic layer was washed with water and brine and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent:hexane/ethyl acetate=10/1-5/1-2/1) to obtain 1.83 g of 2,2-dimethyl-5-oxo-4-phenylpiperazine-1-carboxylic acid t-butyl ester (yield: 53%).

Provenance & Evidence