反应详情

To 4.5 g of ethyl 4-methyl-2-thioxopyrrolidine-3-carboxylate, were added 200 ml of methyl propionate and 7.0 ml of titanium tetraisopropoxide. The resulting mixture was heated under reflux for 3 days. After distilling off the excessive methyl propionate under reduced pressure, water and chloroform were added to the residue and insoluble matters were filtered off. The chloroform layer was washed with water and a saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate. After distilling off the chloroform, ethyl ether was added to the residue to thereby crystallize the same. Thus 2.2 g of the title compound was obtained.

1. temperatureThe resulting mixture was heated
2. temperatureunder reflux for 3 days
3. distillationAfter distilling off the excessive methyl propionate under reduced pressure, water and chloroform
4. additionwere added to the residue and insoluble matters
5. filtrationwere filtered off
6. washThe chloroform layer was washed with water
7. dry with materiala saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate
8. distillationAfter distilling off the chloroform, ethyl ether
9. additionwas added to the residue
10. customto thereby crystallize the same