反应详情

A solution of 4-(3-ethoxycarbonyl-phenyl)-piperazine-1-carboxylic acid tert-butyl ester (5.00 g, 14.95 mmol) in EtOH (50 mL) and NaOH 10% (20 mL) was refluxed for 3 h, then the reaction mixture was cooled to room temperature and the organic solvent evaporated under reduced pressure. The resulting solution was neutralized by the dropwise addition of 1N HCl and the aqueous solution was extracted with EtOAc (3×50 mL) The combined organic layers were dried over Na2SO4, filtered, and concentrated under reduced pressure to obtain 3.90 g of the title compound (85%) without further purification.

1. customthe organic solvent evaporated under reduced pressure
2. additionThe resulting solution was neutralized by the dropwise addition of 1N HCl
3. extractionthe aqueous solution was extracted with EtOAc (3×50 mL) The combined organic layers
4. dry with materialwere dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure