2-Bromo-1-(4-fluorophenyl)ethan-1-one → Tert-butyl 4-[2-(4-fluorophenyl)-2-oxoethyl]piperazine-1-carboxylate

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Reaktionsschritte

tert-Butyl piperazine-1-carboxylate (5.00 g, 26.8 mmol) and 2-bromo-1-(4-fluorophenyl)ethanone (6.99 g, 32.2 mmol) were dissolved in DMF (5 mL) and stirred for 10 min at room temperature. The crude material was purified by column chromatography eluting with a mixture of DCM and MeOH to afford the title compound (3.50 g) as an oil. 1H NMR (Acetonitrile-d3, 400 MHz) δ 1.42 (s, 9H) 2.47 (t, J=5.0 Hz, 4H), 3.36 (t, J=5.0 Hz, 4H), 3.77 (s, 2H), 7.20 (t, J=8.8, 2H), 8.07 (td, J=2.0, 8.8 Hz, 2H). Exact mass calculated for C17H23FN2O3: 322.2. Found: LCMS m/z=323.4 (M+H+).

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