反应详情

Acetyl chloride (0.216 ml, 3.04 mmol) was added to a stirred solution of (3S,5R)-3,5-dimethyl-piperazine-1-carboxylic acid tert-butyl ester (500 mg, 2.34 mmol) and TEA (0.49 ml, 3.51 mmol) in DCM (20 ml). The mixture was stirred at room temperature overnight, then the solvent was evaporated and the residue was partitioned between Et2O and 5% citric acid. The organic phase was dried over Na2SO4 and evaporated in vacuo to give 545 mg of (3S,5R)-4-acetyl-3,5-dimethyl-piperazine-1-carboxylic acid tert-butyl ester as a colourless oil.

1. customthe solvent was evaporated
2. customthe residue was partitioned between Et2O and 5% citric acid
3. dry with materialThe organic phase was dried over Na2SO4
4. customevaporated in vacuo