Dimethylformamide → Benzyl N-(4-aminobutyl)carbamate

Participants

Reaction Steps

1,4-butanediamine dihydrochloride (5.96 g, 37 mmol) was dissolved in water (15 mL), and DMF (50 mL) was added. With rapid stirring, CBZ-Cl (1.0 mL, 7.0 mmol) was added dropwise over 2 minutes. The cloudy solution had pH~2.8. The pH was adjusted to 9.0 with 5 N NaOH, (clear solution) and stirred for 2 hr. 10 The reaction mixture was acidified to pH=1.25, extracted with ether (2 X), made basic (pH>10) with 5 N NaOH, and extracted with dichloromethane (2 X). The dichloromethane fractions were combined and washed with water (2 X), dried and evaporated in vacuo to provide the crude mono-CBZ amine (0.72 g, 3.24 mmol, 46%) which was used as is in the next step.

Provenance & Evidence