反应详情

温度

-20 °C

To a solution of (S)-3-benzyloxycarbonyl-4-phenylbutyric acid (671 mg) in anhydrous tetrahydrofuran (15 ml) were added N-methylmorpholine (0.5 ml) and isobutyl chloroformate (0.38 ml) with stirring at -20° C. for 20 minutes. To the mixture was added a solution of cis-hexahydroisoindoline (313 mg) in anhydrous tetrahydrofuran (5 ml) with stirring at -10 - -20° C. After 1 hour, the deposit was filtered off and the solvent was evaporated under reduced pressure. The residue was dissolved in ethyl acetate and washed successively with 0.5N hydrochloric acid, saturated sodium bicarbonate solution, and brine and dried over MgSO4. After the solvent was evaporated under reduced pressure, the residue was recrystallized from dichloromethane-hexane to give 772 mg of benzyl (S)-2-benzyl-3-(cis-hexahydro-2-isoindolinylcarbonyl)propionate.

1. stirringwith stirring at -10 - -20° C
2. waitAfter 1 hour
3. filtrationthe deposit was filtered off
4. customthe solvent was evaporated under reduced pressure
5. dissolutionThe residue was dissolved in ethyl acetate
6. washwashed successively with 0.5N hydrochloric acid, saturated sodium bicarbonate solution, and brine
7. dry with materialdried over MgSO4
8. customAfter the solvent was evaporated under reduced pressure
9. customthe residue was recrystallized from dichloromethane-hexane