反应详情

温度

20 °C

3.51 g (13.25 mmol) of Cbz-L-Leucine, 2.41 g (1 eq.) of (S)-2-amino-4-butyrolactone hydrobromide, 1.97 g of HOBT (1.1 eq.) and 5.59 g (2.2 eq.) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) is dissolved in 60 ml of anhydrous DMF then 7.64 ml (3.3 eq.) of N,N-diisopropylethylamine is added. The reaction mixture is stirred for 15 hours at 20° C. before being poured into 200 ml of a 1/1 mixture of ethyl acetate/water. After stirring and decantation, the organic solution is washed successively with 100 ml of a saturated solution of NaHCO3, 50 ml of water, 100 ml of a 1M solution of citric acid and finally 100 ml of a solution of salt water. The organic phase is dried over sodium sulphate, filtered and concentrated to dryness under vacuum. The oil obtained is washed using isopentane and then crystallized from a dichloromethane/isopentane mixture. A white solid is obtained with a yield of 68%. Melting point: 130-131° C.

1. stirringAfter stirring
2. washdecantation, the organic solution is washed successively with 100 ml of a saturated solution of NaHCO3, 50 ml of water, 100 ml of a 1M solution of citric acid and finally 100 ml of a solution of salt water
3. dry with materialThe organic phase is dried over sodium sulphate
4. filtrationfiltered
5. concentrationconcentrated to dryness under vacuum
6. customThe oil obtained
7. washis washed
8. customcrystallized from a dichloromethane/isopentane mixture
9. customA white solid is obtained with a yield of 68%