3-Carbamoyl-1-(4-chlorobenzyl)pyrrolidin-2-one → 3-(Aminomethyl)-1-(4-chlorobenzyl)pyrrolidine

Temperature

65 °C

To a solution of 3-carbamoyl-1-(4-chlorobenzyl)pyrrolidin-2-one (1.45 g) in THF (15 mL) was added 1.0 N BH3 in THF (25 mL). The reaction mixture was stirred at 65° C. for 15 h. After cooling to room temperature, the solvent was removed under reduced pressure. Water (30 mL) and conc. HCl (10 mL) were added and the mixture was stirred at 100° C. for 2 h and room temperature for 1 h. 2 N NaOH aqueous solution (100 mL) was added and the mixture was extracted with AcOEt (50 mL×3). The combined organic layers were dried over K2C3, filtered and concentrated. Column chromatography (SiO2, 15% CH3OH-5% Et3N in CH2Cl2) afforded 3-(aminomethyl)-1-(4-chlorobenzyl)pyrrolidine (860 mg, 19%) as a colorless oil.

1. temperatureAfter cooling to room temperature
2. customthe solvent was removed under reduced pressure
3. additionWater (30 mL) and conc. HCl (10 mL) were added
4. stirringthe mixture was stirred at 100° C. for 2 h and room temperature for 1 h
5. addition2 N NaOH aqueous solution (100 mL) was added
6. extractionthe mixture was extracted with AcOEt (50 mL×3)
7. customThe combined organic layers were dried over K2C3
8. filtrationfiltered
9. concentrationconcentrated

ORD record

ord-124aa14bea874e86b0f8bb00566789ad

Source dataset

uspto-grants-2002_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06451842B1