p-Fluoronitrobenzene → (2S,5R)-2,5-Dimethyl-1-(4-nitrophenyl)piperazine

Beteiligte Stoffe

Reaktionsschritte

1-Fluoro-4-nitrobenzene (6 g, 42.52 mmol) and (2R,5S)-2,5-dimethylpiperazine (21.9 g, 191.34 mmol) were heated in acetonitrile (20 ml) at 100° C. for 11 h. The solution was concentrated in vacuo, then the residue was partitioned between DCM and water+sat. sodium hydrogen carbonate. The organic extract was washed with water (4 times), brine, dried and concentrated. Chromatography on silica gel with MeOH: DCM (1:99 to 5:95) gave the title compound as an oil which solidified on standing overnight (8.32 g, 83%). NMR (400 MHz) 1.08 (d, 3H), 1.16 (d, 3H), 2.55 (dd, 1H), 3.18 (m, 2H), 3.34 (m, 2H), 3.95 (m, 1H), 6.91 (d, 2H), 8.03 (d, 2H); m/z 236.

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