Dichloromethane → tert-Butyl (3R)-3-(aminomethyl)-4-benzylpiperazine-1-carboxylate

Participants

Reaction Steps

Into a 200 mL round bottom flask was added 15R (6.66 g, 15.3 mmol) and 110 mL of 10:1 dichloromethane:ethanol. Hydrazine hydrate (7.66 g, 10 equiv.) was added and the reaction was heated to reflux for three hours. The precipitate which had formed was removed by filtration through Celite. The filtrate was concentrated under high vacuum and temperature (to remove hydrazine). The residue was resuspended in dichloromethane and the resultant precipitate was removed by filtration through a Buchner funnel. The filtrate was concentrated to leave a clear oil 15S (3.27 g, 73%) which was analytically pure.

Provenance & Evidence