反应详情

温度

50 °C

Ethyl 3-((R)-1-benzyl-5-oxopyrrolidine-2-carboxamido)-2-hydroxy-4-phenylbutanoate (4550 mg raw material from previous step 22.1; max. 10.72 mmol) dissolved in 13 ml of ethanol was treated with 6.43 ml 2N aq. NaOH overnight at room temperature. To complete the reaction, the mixture was then heated to 50° C. for 2 h. Water was added followed by extraction with MTBE (3×). The aqueous layer was acidified to pH 3 using 2M HCl and extracted three times with dichloromethane. The combined dichloromethane layers were then successively washed with water and brine, dried over Na2SO4 and the solvent was removed under reduced pressure. The title compound was obtained as a pale brown powder (2450 mg, yield: 58%).

1. customthe reaction
2. extractionfollowed by extraction with MTBE (3×)
3. extractionextracted three times with dichloromethane
4. washThe combined dichloromethane layers were then successively washed with water and brine
5. dry with materialdried over Na2SO4
6. customthe solvent was removed under reduced pressure