反应详情

温度

99.5 °C

90 mL of dehydrated N,N-dimethylformamide was added to 2.58 g of benzene ruthenium (II) chloride dimer (5.15 mmol) and 6.73 g of (S)-(−)-2,2,′-bis(diphenylphosphino)-1,1-binaphthyl (S-BINAP) (10.8 mmol). The mixture was stirred for 10 minutes in an oil bath at an external temperature of 97 to 102° C. in an argon atmosphere. Subsequently, the mixture was stood to be cooled at room temperature. Volatile materials were evaporated under reduced pressure in an oil bath at an external temperature of 50 to 60° C. to give a catalyst. 300 g of 1-benzyl 3-ethyl 4-oxopyrrolidine-1,3-dicarboxylate (1.03 mol) and 500 mL of dehydrated dichloromethane were placed in an autoclave and the ruthenium catalyst dissolved in 850 mL of dehydrated dichloromethane was added. The mixture was stirred for 6 hours under a hydrogen pressure of 5 MPa at an external temperature of 50 to 62° C. Hydrogen was released and the reaction mixture was concentrated under reduced pressure. This gave 320 g of the title compound as a green oil. This product was used in the subsequent step without further purification.

1. temperatureto be cooled at room temperature
2. customVolatile materials were evaporated under reduced pressure in an oil bath at an external temperature of 50 to 60° C.
3. customto give a catalyst
4. additionwas added
5. stirringThe mixture was stirred for 6 hours under a hydrogen pressure of 5 MPa at an external temperature of 50 to 62° C
6. concentrationthe reaction mixture was concentrated under reduced pressure
7. customThis product was used in the subsequent step without further purification