Benzene, 1-fluoro-2-methyl-4-nitro- → 1-Acetyl-4-(2-methyl-4-nitrophenyl)piperazine

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1-Butyl-3-methylimidazolium hexafluorophosphate (1.75 g, 7.7 mmol) and acetyl piperazine (39.7 g, 309.4 mmol) was added to a stirred solution of 2-fluoro-5-nitrotoluene (12 g, 77.4 mmol) in MeCN (3 mL) and heated to 85° C. for 2 h. The reaction was cooled and concentrated in vacuo. Water (100 mL) was added to the resulting residue and the reaction extracted with EtOAc (3×100 mL). The solvent was dried (MgSO4), filtered, and concentrated in vacuo to yield the product as a yellow solid which was triturated with isohexane and dried in vacuo at 60° C.; 1H NMR δ 8.05 (2H, m), 7.14 (1H, d), 3.64-3.58 (4H, m), 3.05-2.94 (4H, m), 2.37 (3H, s), 2.37 (3H, s); MS m/e MH+ 264.

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