反应详情

Into a stirred solution of (S)-2-(3-carboxypropyl)-piperazine-1,4-dicarboxylic acid di-tert-butyl ester (0.596 g, 1.60 mmol) in THF add 1.0 M BH3 in THF (3.2 mL, 3.20 mmol) and continue stirring overnight. Concentrate the mixture under reduced pressure, dilute with H2O (30 mL) and extract with EtOAc (3×50 mL). Dry the organic layers with Na2SO4 filter concentrate under reduced pressure, azeotrope the residue with CH2Cl2/hexanes (1:2) and place the residue under vacuum to give the title compound: colorless solid (0.604 g), mass spectrum (m/e):359.12 (M+H).

1. concentrationConcentrate the mixture under reduced pressure
2. additiondilute with H2O (30 mL)
3. extractionextract with EtOAc (3×50 mL)
4. dry with materialDry the organic layers with Na2SO4
5. filtrationfilter
6. concentrationconcentrate under reduced pressure