Dimethyl Sulfoxide → 1-(3-Cyanophenyl)piperazine

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A mixture of 3-fluorobenzonitrile (3.0 g, 25 mmol), piperazine (11.8 g, 137 mmol) and dimethylsulphoxide (20 ml) is heated at 100° C. for 48 hours under an atmosphere of nitrogen. The reaction mixture is then cooled, poured into water (200 ml) and the resultant precipitate collected. This solid is chromatographed on silica gel (dichloromethane) to give the title compound as a white solid (6.7 g). 1H NMR (DMSO, 500 MHz) δ7.15-7.40 (m, 4H), 3.28 (m, 3H), 3.12 (m, 1H), 2.80 (m, 1H), 2.59 (m, 3H).

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