Trifluoroacetic acid → 1-[(Dimethylphosphoryl)methyl]piperazine

Participants

Reaction Steps

tert-butyl 4-[(dimethylphosphoryl)methyl]piperazine-1-carboxylate (1.01 g, 3.66 mmole) was dissolved in 7 mL of anhydrous dichloromethane. At 0° C., 7 mL of TFA:DCM=1:1 solution was added in 3 portions. The reaction mixture was stirred at this temperature for 15 minutes before another 3.5 mL of TFA was added, and then continued to stir at room temperature for 2 hours. Volatile components were evaporated and yield light yellow oil. The crude mixture was directly carried into next step. MS (LC/MS): 199.2 [M+Na]

Provenance & Evidence