反应详情

温度

-10 °C

A solution of diethyl (S)-2-(4-aminophthalimido)glutarate (10.5 g, 30.2 mmol) in ethanol (150 ml) was cooled in an acetonitrile/CO2 bath. Concentrated HCl (25 ml) was added followed by 30 mesh granular Zn (10.5 g, 0.161 mole) (Fisher) when the internal temperature has reached −40° C. The reaction mixure was stirred 1.5 hours at this temperature and a further 1 hour at −10° C. The excess of Zn was filtered from the solution, 10% palladium on carbon (1.0 g) was added, and the solution shaken under hydrogen at (30-50 psi) overnight. The catalyst was removed by filtration through celite and the filtrate concentrated in vacuo. The residue was absorbed onto silica gel (15 g) and purified by chromatography on silica gel (440 g) eluting with ethyl acetate:methylene chloride (1:14 g).

1. customhas reached −40° C
2. filtrationThe excess of Zn was filtered from the solution, 10% palladium on carbon (1.0 g)
3. additionwas added
4. stirringthe solution shaken under hydrogen at (30-50 psi) overnight
5. customThe catalyst was removed by filtration through celite
6. concentrationthe filtrate concentrated in vacuo
7. customThe residue was absorbed onto silica gel (15 g)
8. custompurified by chromatography on silica gel (440 g)
9. washeluting with ethyl acetate