反应详情

A solution of 4-(bromomethyl)-2-fluoro-1-nitrobenzene (232 mg, 1 mmol) and Hunig's base (0.192 mL, 1.1 mmol) in DMF (3 mL) was treated with 1,1-dimethylethyl (2S)-2-methyl-1-piperazinecarboxylate (200 mg, 1 mmol) in DMF (3 mL) and stirred at room temperature for 20 minutes. The reaction mixture was concentrated, re-dissolved in DCM and washed with water and brine, then dried and concentrated. The crude product was purified by column chromatography. Elution with EtOAc/pentane yielded the title compound as a colourless gum (327 mg). δH (CDCl3, 400 MHz) 8.03 (1H, m), 7.34 (1H, dd), 7.27 (1H, m), 4.22 (1H, br.s), 3.84 (1H, d), 3.58 (1H, d), 3.47 (1H, d), 3.13 (1H, td), 2.72 (1H, m), 2.54 (1H, m), 2.22 (1H, dd), 2.09 (1H, m), 1.46 (9H, s), 1.26 (3H, d) [δvalues corrected for incorrectly referenced TMS at 0.62 ppm on spectrum].

1. concentrationThe reaction mixture was concentrated
2. dissolutionre-dissolved in DCM
3. washwashed with water and brine
4. customdried
5. concentrationconcentrated
6. customThe crude product was purified by column chromatography
7. washElution with EtOAc/pentane