Benzylamine → 4-(3-Benzylamino-2-nitro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

4-(3-Fluoro-2-nitro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester (0.300 g, 0.923 mmol) and benzylamine (0.110 mL, 1.015 mmol) were combined in 1 mL dimethylsulfoxide with potassium carbonate (0.318 g, 2.308 mmol), and the reaction mixture was heated to 120° C. for 2 hours. The reaction mixture was poured onto 100 g icewater and extracted twice with 100 mL ethyl acetate. The combined organic phases were washed twice with 50 mL water, once with 50 mL brine, dried over sodium sulfate, and concentrated in vacuo. The residue is purified by flash chromatography (1% to 15% ethyl acetate in hexanes) to afford 0.208 g (0.50 mmol, 54%) of 4-(3-benzylamino-2-nitro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester. MS: 413 (M+H)+.

Provenance & Evidence