反应详情

Succinic anhydride (67 mmoles, 6.7 g.) is dissolved in 100 ml. of hot glacial acetic acid and cooled to room temperature. To this, while stirring (67 mmoles, 7.7 g.) L-proline is added. After 20 hours at room temperature, the reaction mixture is concentrated to dryness in vacuo. The residue is extracted three times with hot ethyl acetate and cooled to room temperature. To the pooled extracts containing the 1-(3-carboxypropanoyl)-L-proline, dicyclohexylamine is added and crystals form which are recrystallized from hot isopropanol, yield 11.3 g. The dicyclohexylamine salt has m.p. (170) 175°-177°.

1. additionis added
2. concentrationthe reaction mixture is concentrated to dryness in vacuo
3. extractionThe residue is extracted three times with hot ethyl acetate
4. additionTo the pooled extracts containing the 1-(3-carboxypropanoyl)-L-proline, dicyclohexylamine
5. additionis added
6. customcrystals form which are recrystallized from hot isopropanol, yield 11.3 g
7. custom(170) 175°-177°