Reaktion #621926

Reaktionsgleichung

4-(bromomethyl)-2-fluoro-1-nitrobenzene

Hunig's base

1,1-dimethylethyl (2S)-2-methyl-1-piperazinecarboxylate

→

title compound

Ausbeute 92.5%

1,1-Dimethylethyl(2S)-4-[(3-fluoro-4-nitrophenyl)methyl]-2-methyl-1-piperazinecarboxylate

Ausbeute 92.5%

Lösungsmittel

DMF

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenThe reaction mixture was concentrated
2. 2
   workup.DISSOLUTIONre-dissolved in DCM
3. 3
   Waschenwashed with water and brine
4. 4
   Sonstigedried
5. 5
   Einengenconcentrated
6. 6
   SonstigeThe crude product was purified by column chromatography
7. 7
   WaschenElution with EtOAc/pentane

Vorschrift

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) [values corrected for incorrectly referenced TMS at 0.62 ppm on spectrum].

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