Diisopropylethylamine → Tert-butyl 4-(3,4-dinitrophenyl)-3-methylpiperazine-1-carboxylate

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4-Fluoro-1,2-dinitrobenzene (0.93 g, 5.0 mmol, commercially available from Oakwood Products) and tert-butyl 3-methylpiperazine-1-carboxylate (1.0 g, 5.0 mmol) were dissolved in 3 mL of DMA, and 3 mL of diisopropylethylamine was added. The mixture was stirred at 50° C. overnight, and then cooled to room temperature, separated between ethyl acetate and water. The combined organic were washed with water, brine, dried with anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue was separated by silica gel column (20% to 40% ethyl acetate in hexanes) to give 1.0 g of tert-butyl 4-(3,4-dinitrophenyl)-3-methylpiperazine-1-carboxylate. 1H-NMR (400 MHz, CDCl3): δ 8.05 (d, 2H), 6.84 (m, 2H), 3.90-4.10 (m, 3H), 3.05-3.60 (m, 4H), 1.50 (s, 9H), 1.10 (s, 3H). MS (EI): 367 (MH+).

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