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 K2CO3, 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. dry with materialThe combined organic layers were dried over K2CO3
8. filtrationfiltered
9. concentrationconcentrated

ORD record

ord-955fb4d0dc9747289e3a10870e361780

Source dataset

uspto-grants-2002_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06410566B1