反应详情

6.64 g of sodium acetate (anhydrous) and 18 ml of acetone are added to a solution of 6.40 g of E-2-amino-4-methyl-5-phosphono-3-pentenoic acid ethyl ester in 54 ml of water and 18 ml of glacial acetic acid. 17.67 g ofsodium borohydride are added in approximately 70 portions within a period of 90 minutes with intensive cooling with ice/sodium chloride, 18 ml of acetone being added after 20 minutes and after 50 minutes. When the addition is complete, the thick white suspension is stirred at 0° for 30 minutes to complete the reaction, and then 1N hydrochloric acid is added dropwise until an acidic reaction to Congo red takes place. The resulting clear solution is concentrated by evaporation in vacuo, and the residue is concentrated by evaporation twice more after the addition of ethanol. The residue is then stirred with 200 ml of ethanol at room temperature, and the undissolved material is filtered off and washed with ethanol. The filtrate is concentrated by evaporation in vacuo, and the residue is recrystallised from isopropanol.

1. additionadded after 20 minutes and after 50 minutes
2. additionWhen the addition
3. customthe reaction
4. concentrationThe resulting clear solution is concentrated by evaporation in vacuo
5. concentrationthe residue is concentrated by evaporation twice more
6. additionafter the addition of ethanol
7. stirringThe residue is then stirred with 200 ml of ethanol at room temperature
8. filtrationthe undissolved material is filtered off
9. washwashed with ethanol
10. concentrationThe filtrate is concentrated by evaporation in vacuo
11. customthe residue is recrystallised from isopropanol